As a person that has played on ps2 and 360 (played with launch 360 locked ups, rrod fixed xbox and a elite xbox)and had duel boxed both them at the same time at one time and currently on the xbox 360 the slim version most thing op has said is wrong the only thing right is the gamma and that just the emulater that there using to run the game since game coded to run a dial up game when xbox was design run on a high speed connection.

Yes older xbox hardware has a hard time with some of the stuff op has said he was right but outdated, but most new version of the xbox 360 hardware side has fixed it might be some the software updates microsoft done or square done over the yrs or just the hardware on the newer systems running the emulater program better.

Most of the issues with game is the game was programmed to run a dial-up speed and a xbox hardware was design to run high speeds connection reason there are a few issues with xbox version if they fixed the game and drop all the old dial up code then xbox and pc version game would be insane.