Right off the bat, I've been playing a helluva lot of Kirby games lately (Intervention time mayhaps?). I managed to 100% beat Squeak Squad. It was a walk in the park outside of Area 3. Which was a minor nuisance because of one chest in 3-4. Twas a good game overall, the controls were nice and fluid, the graphics were well done for 2D, and I love the touch screen storage thing. On the downside, it was pitifully easy, even for a Kirby game, and none of the tracks really caught my interest.
Next is Superstar Ultra, which I played to 98% completion (all that's left is to beat Helper to Hero with every helper, and to beat the True Arena, the latter I haven't attempted yet). I was quite happy with this game, good graphics (for 2D), lots of stuff to do in the game, a minor twinge of difficulty (though it's still easy), great music, and fluid controls. Probably one of my favorite DS titles thus far. Also, Kracko's a bitch in this game. :<
Then there's Amazing Mirror. It was great, I'll admit. Though, at times, the game was a bit confusing with the whole mirror transport thing (Cherry Spray Paint proved to be the hardest treasure to get because the game didn't explain the fact that two doors in that room lead to Area 4, but I digress), but I got used to it after a while. The graphics were nice, the music was almost as good as SSU, and the graphics were good for a GBA game. On the downside, the bosses outside of Titan and the Hands were laughably easy. Especially the Final Bosses with the Master ability.
Now, on the other side of things, Canvas Curse. An interesting premise executed horribly. The controls are stylus only, and are incredibly hard to use, even after you've gotten used to them. And the boss fights? Easy as hell. On the brightside, the music is good, and so are the graphics. It's pleasing to the eye, but torture to the hand.
I also picked up Earthbound, and after a little playing, I'm pleased with the game so far. New Age Retro Hippie is the best generic enemy in history.