Are you sure it's all patched and up to date?
I found it to be quite polished, and by 'quite' I mean I didn't hit one single bug or glitch (EDIT..that stuck out enough for me to notice), although I do certainly concede exceptions to one's personal experiences.
Well it isn't that the game is buggy, it's just that the combat/engine is a struggle to deal with. Fighting the bugs in particular is very annoying, because they're easy to dispatch, but the astral form only lasts one turn, and you need to hit them four times to kill, and with the weapons needing to be reloaded every two shots (which is a tiresome and painfully long process), each character can only get two shots at them. So if your characters miss, you need to repeat the process of killing the bug and then have to again try and take down the astral form. It isn't challenging, it's just a huge waste of time.
I really must have enjoyed the game far too much to notice a lot of the issues people seem to have with the game. I found it quite smooth to play, never had enough of a problem with the engine for it to have become an annoyance, enjoyed the new animations a whole lot and didn't find any problems with the mechanics... I'll agree on your point about the centring camera, but this isn't the only game to have that, it's come to be expected, although, not appreciated. I found the lack of persistence and proper inventory management a pity but only because the game would have been much better with them, but it's not 'bad' without them.
Yeah, I love this game all over.