Great game
Aside from getting some stupid online comments because I'm female I love the online matchmaking. I haven't played any of the previous Halos aside from the very first one so I'm unsure of what is new and what isn't but I really like that new forge feature (I like messing with all the stuff).
The only thing that really sucks about this game is that you can't dual weild guns. Although I think the power that they put behind the guns somewhat made up for that. Perhaps it was to make the game for difficult.
I also felt that the graphics were much better from the previous games (the movements as well)
The Ranking systems is also very cool. I would have liked to design my own armor.
All in all Halo reach is very entertaining. I'm almost on every single day.