capnfapn7v7 seems like it would be the perfect format gameplay-wise to me, because you could have your 7th always playing a utility, but I also feel like it would either be just him/her always playing heavy or it would end up as some retarded "guess what the other team is gonna run and run his counter" sort of thing : /
both teams having a 24/7 sniper could potentially speed up the stalemates because each team would have a pick class.
IDK THEORYCRAFTFORTRESS2
It actually ended up being very slow. But, it's hard to say if it was that the game was new and certain things weren't perfected yet, or the fault of 7v7 format. But I do know that going to 6v6 made the game a much faster format.
But, you have to take in the fact that jumps weren't as efficient, demo played with scouts, solly and demo had 32 shots, so you could spam forever, and things like gunboats weren't around. On the plus side, the game was optimized very well, so my old Athlon ran the game at like 120 FPS.