I've been lurking on his board for a while now, and finally this is my time to shine!
I pretty much picked up the Dreamcast for Soul Calibur. I must have dumped almost 400 + hours into that. And I loved it. Heck I picked up Soul Blade, and even did everything in that game just to get a better basis for the second.
However with the release of 2 and 3. I feel the game has gone down in quality. not the story or character designs. Those have remained top of the line (exclude Heihachi, Necrid, Cherade, Link and Spawn. They are not people, so they don't count :) ).
I do feel however that the move set has become more towards cheap combos and less intelligent fighting. I'm sorry if that comes out awkward. I just don't know to put it. The second and especially the third one, just felt cheap. I do however enjoy how many characters are in the third one(Nightmare and Seigfreid Schautauffen being two characters = perfect). Keeping the specialist weapons, another great idea. And the branching story lines where a great idea, but implemented poorly (too many duplicates, such as chase this person here, or dodge this cage on this level every time). But the rpg strategy battle and Create-A-Soul were just bad additions.
I went though the whole thing using the barbarian move set and the Greatsword. Just using the <-, <-, Vert attack and beat the game with out a single loss.
Regarding the fighting engine, I have noticed several glitches and slow downs (I'm not the only one as this gets dragged to the forefront of any SC heavy board, so I'm not going to speak about it here). In the end, as much as I love the characters, and the game, I feel SC was the best and the second and third just felt rushed.