me and my girlfriend have been playing it... its meh' they use the wii mote, but really i think it would have been more fun with a gamecube controller. And the graphics are gamecube or worse, and if you have a widescreen, you're gonna' be upset, you get to look at pretty little wallpaper on both sides because the image doesn't fit your tv. Try it first, but probably not worth it.
I played it with a full party of 4 two nights ago. It was great fun as I expected. The wiimote interaction is fun but a bit stretched at times. Like for example you flick it up just to hit the dice. Is that really necessary? Whatever.
I do wish I had a controller though sometimes. I was disappointed however to find how many of the mini games simply make you use the wiimote like a standard controller with the dpad and buttons.
And I dont know wtf you are talking about with the graphics. Sure they may not be that much BETTER but they can do a lot more shit on screen at once.
4 is the only one I enjoyed. Although 7 consecutive hootenanys on Mario Party 2 at 4 in the morning is one of my best (read: most drunken) gaming experiences ever. Won't be getting this one.
Not looking forward to much till later on in the year:
RE4: Wii
RE: UC
SSBB
SPM
SMG
MP3: C
D: DoC
PH
WiiM
WiiH
BWii
M&SatO
SC: L
Sadness
The list goes on. Guess all those acronyms and I'll give you a cookie.