The series keeps improving in my opinion (not the music as I only really liked one song - pharaoh man stage).
Charge shot is here! The gameplay is still top notch (no more megaman slides on its own like on a freeze surface - I guess that was corrected on 3) and the bosses are also enjoyable enough.
The story was interesting with new characters introduced and protoman returning.
The last stretch was a bit too much with so many stages and bosses tho.