Here's a good screen from "Kirby's Adventure":

I agree, it was quite a good lookin' game for the NES.
"Totally Rad" wasn't bad graphically, although I don't know if it was one of the best. Some of the bosses looked pretty good for the NES (even if they did take place on blank backgrounds). Here, I pulled them from my emulator.

As Ptoing stated previously, Shatterhand is also a really good one.