Summary: Well, it has been over a decade since Mega Man 8 was out, and Capcom has FINALLY decided to release a sequel! Is it well worth the wait, though? Well, I think it's safe to say so. Mega Man 9 is a game that takes us Mega Man fans back to the basics...literally. The 8-Bit graphics, sound, etc SCREAM "Retro", and those who grew up with the series will freak with joy as they begin playing what they know as an all-new classic Mega Man game!
Summary: AND now, Mega Man 10 is coming out! Keep them coming! MM 9 is a fascinating sequel to a stunning series, play today! Also, if you like retro games, check out Retro Gamer Magazine. The price is a little high for a magazine, but they go for like 60 bucks an issue on ebay, so I recommend a subscription. Great stuff! It's definitely the best thing I've seen that's dedicated to older games and the games and systems of yesteryear.
Summary: Mega Man 9 is just as you remember your Mega Man games from the NES. Same graphics, same sounds, same controls. A bit harder though, perhaps to cater to it's now older audience. Just like the other Mega Man games, repetition and memorization is the key to beat it.