A couple people said they didn't like it as much...apparently grenades are less accurate, heavy weapon recoil makes it hard to aim (as in real life, an automatic weapon will drift upwards with sustained fire), if you melee while double weilding you drop a weapon, etc.

I haven't played it yet, so I don't know if the good outweighs the bad. I did play multiplayer Halo 1 last night for the first time in quite a while, and it was great. My roommates who haven't played much teamed up against me, who haven't played much VS. but have spent many many hours on campaign mode. It was a slaughter. Very satisfying. And yet deceiving because I know how easily most people could slaughter me.

I guess they were just THAT bad.