You can right click the game in your Steam games list and see what the update is all about, be thankful you don't play TF2, you'd be complaining a lot more about the amount of updates, and with every update come fixes, and fixes of the fixes.

Source Engine Changes (CS:S, DoD:S, TF2)

• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">The mat_hdr_level, r_rootlod, and r_waterforceexpensive settings are now saved in the user’s config file.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed clients being able to connect to servers with spoofed SteamIDs.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed a bug where some video configurations could get reset by restarting the engine.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed materials compiled into a map not being loaded correctly if they're in the root materials folder.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed a case of uneven performance on multicore machines.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed point contents not respecting detail brushes. This fixes a bullet penetration bug in some community maps.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed clients being able to spam servers using the ai_set_move_height_epsilon, mission_show, and sv_querycache_stats commands.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Audio fixes:
  
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Reduced overlap in the sound timing code.
    
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed a case where audio could skip.
    
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed voice communication getting corrupted while playing on a Mac.
    
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">sv_pure 2 now protects the game_sounds files in the scripts directory.
  

Counter-Strike Source

• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed prediction errors that were causing greater weapon inaccuracy (bullet spread) on client than server.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Made the bomb the primary target of a +USE command. This fixes a problem with objects placed around the bombsite interrupting defuse attempts. 
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed the ‘skating’ behavior that could occur when a bomb planting attempt was aborted. Also fixes the resulting out of sync hit boxes.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed bug in which a player who crouched rapidly and repeatedly was seen as stationery by other players.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed problem in which the sound of a reload that was occurring when a player was killed persisted into spectator mode, making it sound like a reload was taking place near the spectated player.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Gave chat interface priority over scoreboard to reduce conflict between the two.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Increased size of HUD icons.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed bug with env_hudhint that caused problems when its value was greater than 255 characters. 
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Made the message of the day screen dismissible by hitting ENTER.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed servers not being able to set sv_hudhint_sound.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Gun sounds now match up with the framerate dependent sound timing, and fixed the framerate dependent jittering bugs.
  
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Stats:
  
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed an issue that could cause loss of player stats if network connectivity was lost briefly, just after launching the game.
    
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed an issue that caused the favorite weapon to display incorrectly on the stats summary page when a player achieves the most kills with a knife or grenade.
    
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Made newly-earned achievements and stats immediately update in the achievements and stats panels instead of showing stale data.
    
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Improved the font on the achievement toast.
    
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Community Requests:
  
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Added cvar sv_enablebunnyhopping, defaulted to 0. ( A value of 1 autotags the server with "bunnyhop" )
    
  • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">De_dust and De_dust2 updated.
    
    • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed several exploits.
      
    • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed collisions on crenellation and domes.
      
    • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Fixed minor visual glitches.
      
    • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Adjusted HDR settings.
      
    • http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Removed dust clouds.
      
• http://cdn.store.steampowered.com/public/images/v5/dash1.gif); color: #999999; padding: 0px;">Added console variable cl_hudhint_sound.

You're forgetting that they don't have Cap in America. So to them it's just a matter of downloading and playing without having to worry about spending anything.

mine was about 45mb

Just Breathe

aaaaand another update haha

omg