Bought last night. Already beat the eight robot masters. Decided to stop there, I don't want to finish it in one night.
It is easier than MM9, overall. Seems like it's easier to stock up on E-Tanks. I apparently chose a horrible order, because I didn't have any real weakness weapons for the bosses until the sixth one I took on.
This one just isn't as inspired, so far. I still need to play through the Wily stages, obviously, before rendering any sort of final judgment. It's still good, though. It's just not AAA-quality this time. Still better than a ton of action games that have come out in the last couple of years.