Remember that you have 3 or 2 dices x number of ships x number of squadrons in range. Considering TIE has 3hp you can kill 6 squadrons multiple times over.
I think that anti squadron might be to strong becouse you have your set numebr of dice against EVRY squadron in range.
TIE-fighters aren't anti-capital, though. That's where the bombers come in, which seem to have... at least 4, maybe 5 HP.
Still, best to keep your bombers spread if you're playing Imperial, it seems.
Edited by keroko