I played Rockman Mega World... a fantastic compilation of the first three Rockman games, ported from the Famicom on to the Mega Drive with a twist. A lot of people don't like that 'twist', thoguh and in the end, it seems to be a matter of how much you're attached to the original releases on one side and on the other, how much you're a Mega Drive fan. I'm a huge one, so the reworked audio-visuals, as well as the whole collection, are right up my alley.
First, I noticed that the Yamaha YM2612 was used to great effect by Kinuyo Yamashita of Castlevania fame. Warm, catchy chip-tunes will greet you right after the Capcom jingle. Equally, graphics make use of the most renowned Mega Drive patterns: tiles, bricks, industrial structures and all nature like clouds or trees will give you a perfect Mega Drive feel and occasionally remind you of other games on Sega's former flagship. Additional parallax planes and the (in)famous color palette are also on board, making it a well rounded package.
What's with these sour rebukes towards these ports you probably heard about? Well, the criticism regarding controlls is a minor, because they work excellent in their own right, with the only gripe being a slight difference compared to the original design: the addition of sidestepping. It performs tight, but also causes a nanosecond-short delay before running off. Yet, in my opinion, that difference adds Rockman kind of a new element and as an avatar, he even gains additional character because of it. It's easy to imagine how the same critics would miss that feature, if it was implemented in the original games, but "corrected" on later ports.
No, the real gripe is slow-down, or rather inconsistent slow-down, which can take a little adaption, notably during boss fights. Overclocking solves the problem, though, so it's only an issue if you play it on default, but even so: once you adapt to it, the overall brilliant atmosphere of the games will make you forget about it during those heart stopping encounters with Wily's mechanical henchmen − especially because, this time around, they're practically flicker-free.
So, for me personally, the advantages far outweigh the disadvantages, or rather the only disadvantage, which is slow-down, but I can understand, that if you're not a Mega Drive fan, these remakes will leave you cold, disappointed or even seriously annoyed. It's defining, that the US, where the most ravaging reviews come from these days, didn't get an official retail release of Rockman Mega World. It seems that for once, Sega displayed exemplary foresight and care in regards to their American customers.