The toolgun is mightier than the crowbar.
What might be right for you, may not be right for some. To hell with those squares! Garry's Mod is the greatest game I've ever played because it's not a game. Its a sandbox! I'm one of those guys that buys a shiny new RTS and then builds a base that's the cats pajamas and nothing more. When you get down to Garry's Mod's core selling point it's the fact that people like making crap. And man oh man did I love my legos. A lot of people I know hate this game unless they start spawning a zombie horde while using a lua coded nuke. It's probably the best game purchase I have ever made, being $10 for literally HUNDREDS of hours of game play and counting...
If your someone that loves to build pointless contraptions that accomplish nothing but make you go "Oh that was keen!" then gmod is the game for you!