How do you know that? [And you're wrong by the way]
I'm not saying I don't like challenge in games. I'm saying I hate it when people will claim they hate games like Galaxy for being "too easy." Most of us have been playing video games since we were little kids, it's only natural that we'd get better and find new games to be a piece of cake. It's selfish to wish all games kept up with us and to complain about every game designed with easier learning curves.
It also mystifies me how people with that same backstory still are not good at games they played when they were little kids. Super Mario Bros. is a piece of cake, more so than Galaxy.
Edit: And in the case of Mega Man games, the older ones are truly too hard. Maybe I'm abnormal but when a game is as hard as the classic Mega Man games, I get tired of dying and say "Okay I'm not playing this anymore." Similarly, I can't bring myself to play Very Hard Chapter 5 of F-ZERO GX more than three tries in a row anymore. It's impossibly difficult, the main reward would be having unlocked every character (the last character himself, I don't care much about him).