I was looking at the Nintendo DS and the games available in my local stores recently - it hit me that most of the games were VERY basic, they were all standard puzzle/racing games, nothing exciting bar the gimmick of the touch screen to control it. I didnt see Advance Wars for it, else gimmick or not I'd have walked out with the DS ;)
Now, I like little gimmicks as much as anyone else but the quality of the games I was looking at was abysmal. Most were simple puzzle-style games or bust-a-move like games. I don't buy into 3d shooters on a handheld - it's just not usually much good.
I was also informed that the Nintendo DS didn't handle racing games (like NFSU2) very well, anyone have first hand experiance?
In the end, I decided against it, walked out with an armful of lower-tier yet very intresting PC games (Neuro Hunter, Yu-Gi-Oh online, Republic: The Revolution)
By the way, I'm a huge fan of card combat based games like Yu-Gi-Oh so online version is a godsend for me, sad but true