halo reach isn't a bad game, but if i was going to compare that to halo 3, there are a lot of changes between these two, mainly the special effects.
playing reach, getting shot, special effects indicate enemy
playing h3, getting shot,no special effects, wtf? where is enemy?
this is the kind of things i mean. play reach, a lot!!!
then go to halo 3, matchmaking to see what i mean!!!