I would never claim that the Wii was great as someone's primary system, but there were honestly a hell of a lot of great games on it. It was already mentioned, but the timing was pretty inconsistent, which hurt things. If you owned a PS3 or 360, it was an incredible supplementary system.
But... yeah, I get that for a lot of people it 'collected dust', but I'd argue that the Wii had a line-up of exclusives that were certainly better than the Xbox and, at minimum, rivaled the PS3. They may not have been games like CoD, but that's not really why you should be buying a Nintendo system anyway.
I admit I didn't play mine very much for about 2 years UNTIL Xenoblade Chronicles. I picked that up last summer and spent 160+ hours on it. So my Wii blew off the dust then
. That was my favorite game of this (or last, whatever) gen.
The fact that there is a sequel/similar game coming for the Wii U justifies my Wii U purchase in and of itself. Could I have waited till next Fall? Yeah, probably, considering we haven't turned on the Wii U in over a month now. But I still want to finish up NSMB and play some of the single-player Nintendoland stuff. And I guess I still have that Rayman preorder at Newegg. That, folllowed by Pikmin 3, is plenty for me on the Wii U until Fall. Oh yeah, and maybe I'll finally take the plunge on Monster Hunter. I bought Tri, but never felt like sinking so much time into it so I never started.
The system I would really NOT want to get at launch is the next 360. I can wait a year or two for that (as I did for the 360). However, my soon to be 13 year-old son is a mega 360 fanboy and I won't be able to hold out too long. I kind of hope the thing is sold out for months so I can use that as an excuse not to get one.
The PS4, on the other hand, I will probably want ASAP.