Speaking of [GR], obviously the same things that most of the regulars here have already stated, but a few important things.
1: Awesome clan co-op tactical gameplay..........was that mentioned already...
2: [GR] with all the understated stuff created a lot of intensity without all of the over the top and phony crap in most other games, like excessive and annoying voice overs, radio communications, and shaking/rolling world from every small explosion, etc..... Many of the [GR] players are older/more mature, or whatever, and don't seem to need these console type gimmicks to be entertained.
3. Stability......rarely a crash, even with all the mods that were frequently in use. Our clan played both of the GRAWs quite a bit, but quit because of the constant crashing. Nothing more frustrating than having the server go down just before finishing a mission.