I am thinking of getting Steam because I love MMOGs and Steam is like, the home of all sorts of ludicrous MMOGs.
I like platforming games and games where you build stuff, but I don't really like FPS, and one of the most favourited games (Team Fortress 2) on Steam is an FPS.
Just today, I saw my sister playing Garry's Mod, and I thought it would be an awesome game to play with hundreds of people because it just looks so ludicrous.
I'm also thinking of trying Terraria, but I'm not really into RPGs, either.
So...should I get Steam?