I've red the first dozen comments. and there is definetly pros and cons between the PC and Xbox version. But I really did enjoy Operation Flashpoint: Elite.
After seeing how terrible the ArmA campign was, I went and replayed my old copy of Elite. Still very fun.
The most important aspect of Elite, imho, is that it showed you could port a game as complex and deep as OPF and not lose any major aspects (i.e the full editor). I would gladly buy a 360 copy of ArmA, in addition to my PC version.