I think Megaman 2 was one of the few games in a NES series that was the 2nd game and wasn't a bizarre offshoot that was terrible. The Legend of Zelda on NES was a great game, it's sequel not so much.
Much of the world has been changed with a more Dragon Quest-ish overworld map.
The combat was more like Zelda meets Mario. The result? Pure junk. Such a difficult game too. I know this game has some defenders, but from a guy who goes by Link online, even I can't stand this trash. Some people might think it's great, but I also know people who think cutting themselves feels awesome.