What gamers for Nintendo's 7th gen system do you think never got their due recognition, or are worth checking out but aren't well known?

I wanna say Tatsunoko vs. Capcom, but I'd be lying. It's not overlooked.
It's not looked enough, though. I really wish that was on the VC.

Deadly Creatures and Dead Space Extraction

A couple that come to mind:

1) Resident Evil Umbrella Chronicles:
Nice little arcade shooter and does a pretty good job of condensing the RE timeline for 0, 1 and 3. It also has some side stories that also expand the narrative. It had a sequel called Darkside Chronicles that condensed the the events of 2 and Code Veronica while talking about Leon's relationship with Krauser pre-RE 4. But I don't really like it as much as UC since I don't really like the way the camera moves.

2) No More Heroes:
A nice charming game that uses the motion controls of the Wii Remote a ton. Gameplay can be frustrating at times and the game a bit monotonous between main missions but I feel that Suda's adult humor and such make it more bearable.

Resident Evil 4: Wii edition! That game knew exactly how to use the Wiimote! Best version imo (I have not played the PC version so not sure how that one stacks up)

Elebits - A very good FPS with original ideas, overlooked by its childish look. If the controls were more polished this one would had been excellent.

MLB Power Pros - A great baseball game, probably the best in the system, also overlooked by its childish image. The series is very popular in Japan though.

Order Up! - A great cooking simulator. Very fun and easy to pick up and play.

Pro Evolution Soccer - It takes time to get used to the controls, but once you do is very satisfying. This is a great example of a new way to play with the Wiimote, unfortunately it wasn't as popular on the Wii.

Silent Hill Shattered Memories - Don't know if overlooked, but this is an excellent game, one of the best on the system, and more people should play it.

There's plenty of those:

· Fragile Dreams: Farewell Ruins of the Moon. Now don't take me wrong, the controls of this game are beyond terrible at times. They either don't respond, or don't behave like they should. It would have definitively play miles better with a standard controller. This being said, this game is a brilliant apocaliptic tale, that actually moved me and made me sob at times. As a sucker for survival horror games, this one nail the atmosphere, the feeling of loneliness and has some really powerful sequences. I actually regret never beating this game, but I didn't own it so I could only play it under certain circumstances. Seriously, go play it, it's freaking amazing if you can endure the controls.

· Disaster: Day of Crisis. (Sorry americans, this never released there); IMO the best Monolith Software game despite being universally panned by critics. Why, you might ask? Because this game is lengthy, fun, has some cheesy but great storyline, a nice soundtrack, some damn memorable sequences (some other really absurds, like running away from a tsunami but C'MON DON'T TELL ME THAT DOESN'T SOUND AWESOME) and plenty of replayability. It also rips-off Metal Gear to no end on the second half and IMO that is a good thing, because it gets weird as heck. Fantastic game that I can't honestly understand why would anyone dislike it. Besides, it feels kinda unique since singleplayer survival games are truly scarce, and this one hits some good notes here and there with the theme.

· Dead Rising: Chop till you drop. Not sure if this one is overlooked, but I'm pretty sure it didn't move millions like the 360 version. Anyway, I don't really consider this game the same as the version it supposedly comes from, because it suffers from a massive downgrade in every-single area, story (no alternative endings), gameplay (completely different) and some missing content. Why is it here, though? Because oddly enough, the wii version is addictive. The motion controls add an strange layer of fun, and the sidequests that you get once you've beaten the game are very fun to play and master (something the 360 version actually lacks). If you enjoyed RE4 on the Wii, you'll love DR Chop till you drop, since the control scheme is the very same.

· Silent Hill: Shattered Memories. Very few times videogames have managed to surprise me on the narrative department. I'll simply say this is one of those few games, and despite a poor gameplay system (that boils down to a running simulator, really), the script was simply brilliant.

· Basically all Trauma games that released on Wii. New Blood was fascinating, go for that one if you can only play one!

· Ivy the Kiwi. Fun platformer, with a nice touch of challenging design.

I'll post more if I can think of more overlooked gems.

I thought about including this one considering I much I love it, but it sold a million and a half units, so I wouldn't call it overlooked, really.

I really like Muramasa, House of the Dead, Klonoa, Final Fantasy Chocobo's Dungeon, Dragon Quest Swords, and Madworld, among many others. IMO, the Wii has a BUNCH of hidden/underappreciated gems.

Not even close to overlooked.