Really what the Wii needs is main franchise titles from most or all of these companies to really affirm their support, and that's how i would rate them.
Certainly the 3rd party situation is excellent overall (I, having only gotten into gaming with the N64 and never owning a non-Nintendo system, find it to be almost miraculous), but the composition has mostly bin spin-offs and B-list projects so far. That is changing, however, between Tales, Monster Hunter, Dragon Quest, Capcom vs., Timesplitters (soon enough, you watch), aside from franchises that were founded on Wii and did well enough to move forward, like Lost Winds, Red Steel, Rayman, No More Heroes, Boom Blox, and My Sims
Once again: what wii is missing is specifically that which the PS360 has locked up: High class western support. Epic, iD, Take Two, etc. Though these are the kinds of companies that have scorned Nintendo home consoles in general, and Take Two sounds like it's starting to warm to the idea
Monster Hunter: pissing me off since 2010.