I loved it, but wished there was more space combat. The way they ended it was really well done as well and I'd say it's my favorite campaign after CE. The Elite are much more difficult in Reach. I played on heroic my first play through and they kicked my ass. They move much much faster and headshots are much more difficult. It was exhilarating.
Halo 2's campaign for me was the weakest, but I'm not sure why. I have beat Halo CE on legendary hundreds of time and Halo 3's many many times, but I only beat Halo 2 on legandary once.







