My 1st impressions of MM4 after beating it. MM4 is a bit like fast food, enjoyable, but not a lot of quality to it.
As for what I didn't like in this game, well, Ring man's stage comes to mind. The fact that it not only throws 4 mini bosses at you and several tricky platforms in the beginning wasn't enough, they give you the hardest robot master to deal with in the end. Ring man's stage just felt like a total rom hack, and it's one of my least favorite stages in the classic series. Speaking of unfavorable things, the two castle system arrives again, but this being its first original outing it wasn't so bad. Cossack's castle sucks if only for the lousy checkpoint system and Wily's castle is pretty forgettable. Both castles weren't bad, but they certainly felt tedious. For the big part of it though, 4 is the most average Mega Man game of the bunch, plenty of things that work for and against it.It's just THE cookie cutter Mega Man.
Conclusion: Mega Man 4 is a very average game, and doesn't really excel in anything really. Aside from adding another castle and a charge shot, nothing was really new, and it's quite forgettable at most.