Chocobo Tales: I don't know about this particular game, but all the other chocobo spinoff games were really awful and silly! The target audience is probably 3 year olds!
Mario Party: I imagine it'll be just like the others, but with minigames that are more fun due to the better control system on offer. Also, if you're bored and with a friend, you could probably play on the one cart, I imagine.
Metroid Prime Hunters: It's pretty much the best looking DS game that I've ever played, it translated wonderfully. Less emphasis on puzzles, much shorter, I don't remember ever needing to scan anything, but it's super-fun. Controls brilliantly, and the multiplayer is the best handheld multiplayer I've played outside of Pokemon.
Cooking Mama 2: I have no idea. Is it one of those silly mini-game things? Whatever. Warioware was fun though. The first one. I didn't play the others.
Now I have a question! I am currently loving the shit out of Pokemon Emerald. I'm like 10 hours into it. Diamond/Pearl: Y/N? Why?