For the duration of Reach's existence, BTB has been terrible. But one of the biggest problems in it is how absurdly dominating the Banshee is. I thought I'd dabble in BTB to see if I could snag the jackpot, only to get a Heavies variant on Boneyard with two Banshees on it. The entire map, no matter how much ordnance was on it, came down to Banshees spawn camping. Naturally, I was on the receiving end constantly.
I'm not touching BTB in Reach, ever again. It's worse now with Heavies than it ever has been in its run to date. I'll hold out hope that it's not a disaster in Halo 4.