Too many I'm going between but...

Asphalt Urban GT (DS)
+ gameplay overall
- some stupid objectives or lacking cash to have permission

Mr Driller DS
+ gameplay again, various modes are awesome
- too hard w/out buying/using 'items' but cash earning is v.slow

Kingdom Hearts GBA
+ great story, visuals and audio, overall gameplay
- gameplay though is flawed a bit by card system that can get in the way of action based combat

Donkey Konga
+ sweet new controller design and gameplay offered
- a few tunes truly suck

There's a few other I dabble with still like FF2, MarioDS, Ridge Racer, and Classic NES but I'm going to write a book here.