I'm sorry guys, but I have to call total BS here.
If the E-wing had Rexler's ability, we'd all be going ballistic right now over how broken the Rebels are because of YET ANOTHER awesome new ability. Seriously - stop and ask yourself, if this were on an E-wing with exactly the same offense, would you be saying "Well, yeah, it might be almost good, but since it needs a focus to work so it's really limited."
Pfft. Give me a break, because that doesn't even pass the smell test.
Edit: And just to be clear here, I still think the Imp Aces were underwhelming, I do think the new Rebels are universally awesome, the Defender certainly has a pretty bad dial, and Wave 4 is going to give plenty enough new options to the Rebels so the "Wave 4 will make it all awesome for the Imps" is a silly thing... But come on - if you can't acknowledge Rexler as good, you're so stuck in your own predetermined state of things that you're seriously losing perspective here.
Agreed, very solid ability. Ironically, his ability is a far better imperial counter than rebel counter.