Mega Man 5
As far as NES games go, this one was gorgeous and continued to push the limits of the hardware. The music was slightly tweaked with this version, the first major revision to the familiar tunes since MM2.
The Wikipedia entry for this game sums up the rest: “Mega Man 5 was met with a positive critical reception for its graphics and music, while receiving criticism for its lack of innovation in its plot or gameplay.”
It wasn’t particularly groundbreaking and was more or less, the same ol’ same ol’.