But, then there's the other thing of the fact that if your PC port runs like shit, you already have bad coders since everything is done on the PC in the first place.
Not... exactly. To the second part, that is. Just because people write code on the PC doesn't mean the process of porting 360 or PS3 code to the PC is simple, which is what you seem to be implying. If the PC port runs poorly, then yeah, something bad happened in the porting process but the fact that things were originally written on PC (and not for PC) has pretty much nothing to do with anything.
Well obviously, which is why making assumptions now is silly.Again, the quality of the 360 version of FF13 will depend entirely on the versatility of their coders and their engine.