Don't worry dude, the large number of games to choose from is why it's so amazing! First of all, take a look at the Free-to-Play games (some real gems, like Team Fortress 2) and the ones on sale (generally if there's not a big summer/winter/halloween sale, only buy a game if it's 80%+ off). You can also sort the games by reviews, so stuff like Portal, Garry's Mod and BattleBlock Theatre will come up. Just take a bit of time and look around at the games, see what you like and before you know it, you'll love it. There are some great PC exclusives, indies (better on PC than 3DS) and 3rd party games (that you won't really be able to love on Nintendo consoles, unless it's LEGO).