Even Poe I've found personally underwhelming because his offense is so unimpressive
Oh man, so much this. I flew the Heaver world's list for a bit through Store Champs and that was always my takeaway. Between R2-D2, thrusters and his ability, sure, he could live pretty much forever, but his damage output never matched up. And when the rest of your list is a Z-95, a single unrestricted TLT and a stressbot TLT Y that is going to have a hard time getting things in arc past the first engagement, all at PS2, you need to get your damage output from somewhere and Poe often just couldn't deliver, especially with Wave 8 and the shift to Jumpmasters being everywhere.
Same problem in a variant of the Wes + Biggs + Corran list I tried before GenCon where I swapped Poe in for Corran. Though Poe could live forever, the list just didn't have enough punch to resolve things before his wingmates went down.