Is not the (now more or less fixed) Smuggler & Spies power creep.
No no - it is the fact that you have to play BOTH sides.
Who cares about the rebels, when you can field a fully operational BATTLE STATION and wield the powerful might of the Imperial Navy? !!!
On a more serious note, I don't care much for playing rebels and I really wish that there was a tournament mode / alternative to the usual LS/DS - DS/LS DS/LS - LS/DS setup.
Yes this would invite mirror matches but, I'd rather do that than sit through another game of playing nerf herders and rebel scum. Sadly the game was not balanced around that.
/lament