Red Alert: A Path Beyond 2.1

Guard Duty is another favorite, with close bases where early-game infantry raids are to be expected and artillery exchange is constant.
Gamma is a blast with a good group of people, and having some realistically-sized matches instead of 3v3 has helped us identify problem areas (the M16 is a bit too weak, and the Golden Wrench is a little too weak) that were more difficult to spot before. Things seem great otherwise.