Yep. I don't think I've played every Sonic game, but I've played the majority of them. I kind of gave up on anything after Sonic Adventure 2 though.
A few months ago I bought Chrono Trigger for my DS and didn't get a chance to start playing it until about a month ago. I know I'm years behind on the fan love of this game, but holy crap it's fantastic. I'm not that far into it I don't think, but I love it. My only problem is, when I get frustrated, I stop playing for awhile. I haven't played in a few weeks now though.
I don't have many DS games, so I'm going to list what I have, and if anyone has any suggestions on what I should get, please please PLEASE share :]
Grand Theft Auto: Chinatown Wars
Pokemon Platinum
Super Mario 64 DS
Mario Kart
Chrono Trigger