Well, I played Jade Empire for about 8 hours yesterday. It's great so far. OXM's comment that dialogue is sparse is fricking laughable. There's WAY more dialogue per setting than in KOTOR.
The framerate does dip in the odd circumstance (i.e., camera gets forced really close to the player). I've found it to be quite stable, though. I haven't even gotten close to dieing because of it.
The camera is imperfect, but what 3rd person camera system is perfect? Give it a second or two (which should be easy if you don't suck) and it'll right itself. Given that Jade Empire is not nearly the speedy game that Ninja Gaiden is, I think the camera is quite alright. Plus, if it really bugs you, pause the game and move the camera yourself.
As for the game length, there's quite simply no way I will finish in 20 hours. Bioware specifically designed the game to have a shorter critical path than KOTOR but have about the same amount of content as KOTOR. So if you're not finding and completing sidequests, then you have no one to blame but yourself for the game's length.
And I can already see the game's replayability should be high. So even if you think the game is too short, you should have good reason to play through it at least twice.
Personally, I don't see how Jade gets an 8/10 for graphics. The graphics are stunning. The biggest graphical fault is that the Xbox can't handle the game at higher than 480p with no AA. And when that's the case, 80% is just too low. Of course, this is just my opinion.
The fighting system is simple but not easily mastered. When you have 30 styles, you can't make each one of them have its own control scheme. That'd be insane. The interface is kept simple and identical for a good reason. Switching between styles, attacking, defending, hampering, etc. all make for a great rock-paper-scissors combat experience, IMO. I could only do what Greg says if I set it to easy. And then only maybe. He acts like you only face one guy at a time which is quite wrong. When multiple guys are after you, you can't adopt such a simple plan.
Summary: Play the game for yourself. It's good enough to warrant your interest. Chances are, you'll find it to be excellent.