I'm actually gonna defend Wii's 2011 as quite solid.
That year saw the release of Skyward Sword, Kirby's Return to Dreamland, Xenoblade Chronicles in PAL territories, The Last Story and Pandora's Tower in Japan, Call of Duty Modern Warfare 3, Rayman Origins, de Blob 2, Conduit 2, FAST Racing League...
It was really only the final years, 2006/2012/2016, that were truly dismal. Of those, I'd rank 2016 as the worst as 2006 at least had Twilight Princess and 2012 at least had Project Zero 2: Wii Edition and the Rainfall localizations, whereas 2016 was, for me at least, a total loss with nothing worth buying.