Further down the list:
Castlevania: Dawn of Sorrow - For some reason people are avid fans of this game yet it's nothing but an AoS rehash, except less quality. The funny thing is that they champion it as the best ds CV, when everyone knows that's PoR, a game people seem to think sucks because of its high difficulty and emphasis on platforming and puzzles.
Contact - I remember Japa gaffers praising this game to high heaven upon it's Japanese release and it turned out to be completely meh. It has nice ideas, but it's not fun at all. The skills system, taking a nod from western rpg design, is absolutely confusing because you'll often wonder why you're leveling up your skills when you rarely use them.
Poke'mon Diamond and Peal - It's Poke'mon. Nuff said.
New Super Mario Bros. - for some reason this game is also praised to the high heavens, when it brings nothing new to the Mario franchise, and even further, feels like a half assed Mario product to begin with.
Feel The Magic - It sucks.
Brain Age/Training - It sucks.
Nintendogs - It sucks.
The only DS games I've thoroughly enjoyed are Elite Beat Agents, Kirby: Canvas Curse, Castlevania: PoR, and PW1 and 2. I have not played Etrian nor Ouendan (but EBA is close enough). If one could offer a thorough list of worth while DS games, I would be happy to take a look at it and give the games a shot whenever I rebuy a ds. However, don't blame me if I'm hesitant because almost every other ds game has failed to deliver expectations.