What do you mean by expecting to much?
The Firespray has one attack, if it had to deal with 3 separate targets, entry level characters really can't count on 3 hits from the auto blasters. Then the auto blasters themselves aren't exactly world beaters per hit as well. If you deployed the TIEs in a group the characters were essentially fighting a target that's more maneuverable, faster, with more health, higher skills, and better guns. So I don't know that if they survived that's so bad really.
Edited by 2P51