Mega Man 9 is a great blast from the past with a fantastic retro style.
The robot masters are excellent, from Splash Woman to Plug Man, even with the right weapon they can put up a fight, no one goes down with just one hit. The levels are great in design and have death traps all over. Yeah, there are cheap deaths present, the developers are laughing their rear end off at the robot that swoops down, grabs you and throws you into spikes, killing you instantly before you know what the hell happened. But playing through the stages again and again and again and again is worth doing, and sometimes I didn't even mind. Why? Because the music is so awesome, I can't even tell you, go to YouTube and listen to some of the stage themes, my favorite being the first Dr. Wily stage, that's awesome right there.
Mega Man 9 is an absolutely brutal, but oh, so satisfying game when you finally start getting good at it. Look, I'm a slightly above average skilled gamer, all it takes is practice and then you'll be able to take down Dr. Wily. But however, if it's too much for you, check out Mega Man 10, which has an easy mode.