If you can send me some links for those reviews in particular I'd appreciate it.
Mega Man 2 is massively overrated, but it's a solid game IMO.
The lyrics of the Brentalfloss song (I think it was the first "with lyrics" he made) is basically him reviewing the various games in the series and calling MM7 ****. There's plenty of other examples, but as a whole most games in the series for a good long time were judged almost entirely based on graphics, but now they're some of my series favorites. Heck I once made a blog post on Screwattack and ranted about MM8, X4, X8, and Network Transmission despite enjoying them now that I'm older.
It's definitely not an unwarranted complaint, but I can't help but ask what were fans expecting based on that original prototype video (obviously not those explosions) when even now there's no real consensus as to what direction the Mega Man series should go as a whole? In terms of Mega Man games, Mighty #9 is graphically leaps and bounds better than the last few Mega Man titles.
It's funny but the Mega Man franchise is the inverse of most video game series. Everyone agrees on gameplay, but can't decide on everything else.