Not all the times as games like Gun have prooven
?
Just looking at the IGN and Gamespot reviews... but they don't mention any performance deficiencies vs the versions for Xbox/PS2. Quite the opposite, in fact. And obviously it was running at much higher resolution, with supposedly better draw distance and better textures here and there. It sounds like it was a technically superior version - even if it was ugly vs other 360 games - and that probably was down to sheer performance improvement rather than any particular care with the port. I'd say it was a hurried port, but enough performance can mask a multitude of sins.