I read a lot less constructive criticism regarding the Wii as a platform than any other which isn't telling me that it has the least problems, but rather than its fans that haven't expanded out of their "Nintendo is the only word in gaming" phase are easily the most forgiving.
While I can't agree with the blog in that no great games have been released on the platform since 2007 (No More Heroes, Punch Out and of course fan favorites Smash Bros and Mario Kart all come to mind), as someone who has no need to artificially pump up games that are "must buy" for any given platform (I have them all), the pickings have been pretty slim and my interest in the platform has tapered off to only a few specific titles per year. It often goes weeks and sometimes months between being turned on.
I haven't played Mario games in well over ten years and after MP3 and Twilight Princess, I think my days of enjoying the Metroid and Zelda franchises have come to an end (dating all the way back to the original NES versions).
But it's an opinion really, and the only reason why some are getting so bent out of shape over it is because they still fall into the category of the forgiving Nintendo fan (if you are a single young adult and you praised Wii Music, you may be in that category), which do little to actually improve what we see on the platform. There's plenty on the platform, but it's hardly the be all end all to console gaming this generation, sales rates aside.