Star fox command way to difficult to control with a stylus and Sonic and the dark brotherhood but only because I couldn't see what it was saying the text was way to small.

That's because your practically blind!

Contact.
Seriously.

SHUT UP you're peeving me off about that!!!!!

Pffft, "turned into"? That's how it started, man.

Yoshi Touch & Go: Seriously, I was yawning already in the first level.

Scribblenauts: I think this is still the buggy version of the real game.

Wario: Master of Disguise: Decent platformer, plus it's not that exciting (stupid puzzles!).

I agree with Infinite Space as a bad explained RPG which could be so much better than it is. It doesn't help neither that is a "love or hate" game. In addition, I'd also say Harvest Moon DS (because it feels exactly as a GBA game) and Advance Wars Dark Conflict (as a beginner in that saga I found it pretty frustrating :/ ).
@Mariofanatic128 I can't believe what I've read! This was exactly the problem I had while I was playing the game. I ended up in the same situation and I gave up playing it! It's a pity because this game has a great potential.

I would have to say any game that ties in with a popular toy out on shelves like the bratzs or any barbie game. But I did have trouble with the 1st Rune Factory game, it was frustrating !

I can't believe it hasn't been mentioned yet, but Front Mission DS. I find it rather fun, and I love robots and SRPGs but I just don't understand it. I've read walkthroughs and guides but i'm at a loss with this game. I really tried hard to like it

I have to go with Nintendogs. It was my second DS game I bought (Dawn of Sorrow was the first) and I mainly bought it due to the hype. I played it for a few hours and than got bored of it. I didn't touch it for six months and than I finally traded it in.

Surprised no one has mentioned Raving Rabbids 2 yet. Mini games are decent at first, but end up being rehashed, customization is very limited and the main mode can be finished within hours but with no reason to replay. Heck you actually have to replay mini games to continue in the worlds. I haven't had a copy for years so it may be better than I remember however. By no means awful, just way too cheap.
Pokemon Trozei!- Again, not horrible at all but pointless. Another game I haven't played lately but remember fairly badly. The gameplay wasn't very interesting and all the levels were pretty much the same apart from the difficulty. The legendary swapping was also IMPOSSIBLE. I seriously don't know how they decided on making that so hard.
The Legend of Spyro: The Eternal Night. Again, another game that is not awful. Just so glitchy and bug-filled and so hard to control jumps it's almost cruel at times. Don't get me wrong it's not bad at all but I only kept it with my case to have the full set of games.
Sonic Classics Collection. I honestly don't understand why people say these are the best Sonic games... Sonic Colors DS for the win! Then again I'm not a Sonic fan. /shrug

On the subject of Stafy- Yes, the Y mash was a hand killer. It ate up half my lives just trying to finish that. You had to press like 50 times in three seconds! I ended up holding the DS down with one hand while I just jabbed the button with the other. Ouch. I've only finished the fight four times. Every time I had to use my index finger.
As for Yoshi's Island DS, why do people hate it? Maybe it's just because I hadn't played the original or GBA game at the time but I loved it. It's too bad my copy was a pirate. I should pick a proper one up soon for my 3DS.

Scribblenauts: The controls were so breathtakingly stupid I couldn't forgive the game.

@ChocoGoldfish But it did take your breath away.

Monster Tale has probably been the one that disappointed me the most. The usual game built around a half-baked idea.

movie games,star fox command,cartoon network racing,commando steel disaster(to bloody hard) and some more but i forgot the names

Bee Movie.

I set the bar really low for that game, and it still managed to disappoint me.

I really hate "Lost in Blue 1". I mean, am I the only one that finds that game awful? I've given it a lot of opportunities, but the girl's AI was awful being so difficult to keep her alive if you tried to explore the island. In addition, there were points where, if you hadn't a guide, it was extremely difficult to know what to do (aka "the mystery temple"...).

Another one is Lost Magic, a game with original ideas but that fails to execute them. The difficulty curve was inexistent, so you could find battles that were absolutely easy and, later, you failed miserably in a "only-if-you-are-a-hardcore" mission. Fortunately, the art style is gorgeous (thanks to Studio Ghibli ).

Wario Master Of Disguise: I found the controls very niggly, as the stylus didnt recongnise my stylus drawings. Damn
Imagine: Interior Designer: So. Damn. Repetive
Rayman Raving Rabbids: TV Party: It was OK. Compared to the Wii though, it was AWFUL

FIFA 06: Controls were abnormally difficult, felt rushed up.