I haven't read this thread in its entirety, mainly because it had already devolved into a pointless flame war on the first page. However, here's my two cents on the issue.
I don't think the issue is with movement, per se. The issue is more in a lack of options. Movelists have been trimmed from SC2. There's no more WL moves, many moves have been removed from stances, some moves have been removed entirely, not enough new moves have been added in.
Do I believe this means that every character is played the same at high level? No, not at all. There are numerous different styles to every different character. Herein is where I see the problem though...when you have a limited set of options, character matches devolve.
My playstyle may not be like another Voldo player's, but I guarantee you if we're both playing against a good Cassandra player, you wouldn't be able to tell us apart. Why? Because Cassandra's crouch throws punish so many of Voldo's tools. Soul Calibur has been, and probably always will be, about playing safe. It's what SC2 came down to, it's what SC3 came down to, this game, even with the addition of soul gauge, is headed the same direction.
You take a character's limited toolbox, remove all the tools that don't work against the character you're playing against, and there's not much left. It homogenizes the game. I've learned Hilde recently, and it shows when I play against Lobo locally. He plays Cassandra, and if he does a low move, any low move, he risks losing. If I jump 1A, or 1K, or FC 1B, I can land, hit him with a C3B, and he loses. The round's over if I land a single C3B.
Things are bad when what stage we get on stage select matters more than how well we play our characters. If he gets certain wall stages, I'm almost guaranteed to lose. If I get certain ringout stages, I'm almost guaranteed to win. Soul Calibur feels more like a coin flip playing my Hilde against him than it does a competition of skill. Other matchups, like my Voldo vs Kilik or Ivy, feel very similar. Did Kilik auto-GI me with two Asura Dances? I lose. Did Ivy do 214B out of frame advantage a couple times? I lose. Did I correctly guess when Ivy or Kilik was going to do those moves? I win. The fact that nothing else in the matchup matters except my ability to stop those two moves matters is, in my opinion, the largest problem with Soul Calibur 4.