My take on this is simple:
The Rockman Classic (Rockman 1-7) were great, I don't have any idea why X and Zero had to be created. Not to mention, ZX and the royal crap that Battle Network is. I'm still wondering what happened to Rock and Roll too... I want my platforming, damn it, the Rock Paper Scissors battle model, I wanna be creamed by stage bosses, I want Yuuichi-chan's Papa quality music. On my opinion, Rockman 2 was pinnacle. Rockman 3 was also great but not as good as 2, it didn't feel right. The Robot Masters just started to become stupid after that.