Raph lost his prep stances that made him such an interesting character in SC2 and his range was also reduced considerably. He also lost a lot of great prep stance moves. I would know. I spent months perfecting Raph's methodical play style and to this day, I've yet to encounter anyone who can beat me in SC2 when I'm playing as Raph. I thought all that expertise would transition favorably to SC3...it didn't. Raph felt like a whole new character, and a considerably more inferior one at that. Furthermore, his movelist is even more linear in SC3 than it was in SC2. He simply just isn't an "enthusiast" character like he was before and considering the very distinct and unusual elements of his style, that's not a good thing. As for his "sidestep stances", combo happy characters like Maxi and Talim can easily get around that and give Raph a good whooping.
Of course, unless you've been a dedicated Raph player, it's not possible for you to notice what he's lost in SC3.
As for Mitsurugi, he was my player of choice (along with Maxi) in SC1. They toned down his speed and range a bit in SC2 but pumped him a lot more for SC3. He might be a beginner's player, but for those of us who knew the peculiarities of the character since the days of Soul Blade, it's very easy to exploit his strengths for easy victories even against players who are evenly matched in terms of skill. In SC3, Mitsurugi is kind of like my fallback choice for winning back my dignity whenever I'm getting my ass handed to me by my opponents. I still get a collective groan "oh **** not him again" from everyone whenever I select him.