Hmm interesting. I'd never heard of any of those problems, even after reading 2-3 reviews of the PC version of the game. I suppose I lucked out. The only significant difference between our system is that I run it on Vista.
As for what you said about the port - I wouldn't really call the PC version a "port." Especially not as much as Lost Planet was, which incidentally did not run well at all on my PC. The developers practically reworked the architecture over the several months in the gap between the console release and the PC release, with the extra bonus content and all of that. On top of that, you can see how much better the PC version looks than the 360 one. I've had good results with all U3 engine-related games; I think they look very good and run well, too. This includes GoW, Bioshock, Turok, Mass Effect, and the U3 demo itself. That demo looked great and was smokin' too...I hardly dipped below 100 fps.
Anyway, I would also suggest, with this being the case, that the OP get some more opinions like you suggested, soloman02. Maybe there is an issue and I just got lucky.