Why would you want to waste money on Metroid: Other M?
Kirby's Epic Yarn is pretty great though. Not anything challenging really, but its presentation more than makes up for it.
Donkey Kong Country Returns is a pretty fantastic game. Also, since you have a Wii U I may as well recommend Tropical Freeze too. I still consider the SNES trilogy the best DKC, but they're both games more than worthy of owning.
Both the No More Heroes games are pretty decent too. Well, gameplay-wise they're kinda subpar tbh, but they just have so much style and twisted humor to them that it doesn't really matter. I mean the premise is literally just "geeky otaku murders a bunch of people so he can sleep with a girl he just recently met", which is just about the absolute dumbest premise. But its a dumb as **** game that relishes in that stupidity, and is great because of it. Not to mention, both games just have utterly phenomenal soundtracks. Possibly among the best game soundtracks on the Wii.