Pfffft. Siege Rocks, I only play siege. Capture the flag beats deathmatch in any game, as it does in this one. Balance is perfectly fine. 1st round you get randomly assigned, thus not in the same team as your clanmates, after that you (mostly) get put in the same team as your clan then you can play an organised att/def.
People whining about balance, join a clan that actually knows how to work together and play siege at a decent level. Plenty of those clans around (HRE, Greys, DRZ, ANT, Union etc etc.) If you dont want this, dont whine about them winning cuz they work as a team.