The images I've seen for the Wii version look kiddish and not at all like the 360/PS3 versions. I hope minds were changed on that. The Wiimote and nunchuk would work great as a proton gun/ghost trap combo. Ghostbusters, how can you not love it?
the wii version might be the most fun to play, but it looks like poo in comparison. the ps3/360 versions look awesome, like an actual ghostbusters 3.
i even really think its the ultimate way to turn a movie / franchise into a video game -- not only are they writing an entirely new story for the game, instead of just reliving the movie(s), but they do the character assignments perfectly. you don't play as one of the ghostbusters, and you don't play as some random guy across the world from the ghostbusters -- you play a guy who just signed up to be the 5th ghostbuster. really good efforts into it.