: I felt like the difference was huge. Almost every gun was re-tweaked, and a
: huge number of encounters played vastly different due to the different
: sandbox. The flood in particular did not feel like their Halo 1
: counterparts.

I meant just the run and gun aspect of game play. The weapons seem to be slightly more powerful. The flood seem to be like the Halo 3 flood. The Assault rifle has far more effective range then the original weapon does.