I don't know...I just don't like it much...all you pretty much have to do is hold the building to win. If you don't have a Skyhammer to flush them out then it's hard to get them out of there.
Maybe I'm just getting unlucky with the teams I get...but every time it ends with them camping the building and no one who could wipe a room.
What a shock, always the same few people who report me for spam or abuse! Some people are so small and so petty...