Zelda is alright, it reminds me a lot of the N64 Zeldas... I'm not the biggest fan so I was pretty -meh- about it...
I also bought Red Steel. I really enjoyed that, the controls take a little getting used to but once you get the hang of it, it's pretty fun. It gets really good near the end where you start getting new special moves after each level I think they waited a little too long before introducing some of the more advance techniques so a lot of people get bored with it before you get there.
Replay value on Red Steel is total crap though, I've beaten it, and I'm getting ready to trade it in, I might be worth one more play through but that's it... I can't see very many local multiplayer applications, especially when you consider the learning curve.
I bought Trauma Center for my GF for Christmas, I've played it a bit myself and it's a really fun game... I'm the last person to be even remotely interested in medical/surgical/organic things but I really enjoyed playing the game.
It's nearly identical to the DS version but it's got updated graphics and a few extra levels, so if you've played the DS version it's probably not worth getting, but if not I'd highly recommend it. It's got a rating system for each level so there's a good amount of replay value in going back and replaying specific operations to get a better score. Also being derived from a DS games it's an easy game to just pickup and play for a few minutes and then put it away.
One thing that really pissed me off about Trauma center is that it only supports 480i in fullscreen...

up that's right... I have my Wii on my projector in Widescreen 480p, I was viewing the dashboard in 480p Wide, and as soon as I started the game my projector screen flickered and alerted me that it was now displaying in 640x480 i

... bastards. On a whole though Trauma Center seems to be the
Sleeper Hit title of the Wii. Much like Condemned was on the Xbox 360 and Deathrow on the Xbox 1.
Other games that I've heard good things about are Rayman Raving Rabbits, Elebits, and Super Monkey Ball.... I plan on trading in Red Steel for Super Monkeyball, The idea of playing that game with the Wii remote is really cool

I haven't played any of those titles though.
I hear mixed opinions on Excite Truck, depending on who you talk too the game is either total crap or really fun, though I think most people agree it's a fairly shallow game overall.