I've only been playing Xwing for about 6 weeks now (a very recent convert), and so i don't have much experience of the game. But i do have a great deal of miniature wargames experience (if that has any bearing).
So, i don't have any experience of the dull swarm stage, or much in depth understanding of the issues fuelling the 'fat turret' objections.
I will weigh in with an observation though, based on the two games i had last week.
Game1
I took a B-wing, A-wing, 2 X-wings vs a Decimator (with fat turret build), TIE bomber and TIE interceptor
I won, taking the Decimator out fairly easy
Game 2
I took Firespray (Krassis Trellix), 3 TIEs vs a classic Fat Han build and 2 X-wings
I lost, but only after all the small ships were destroyed and the Firespray and Falcon battered each other down to 1 Hit each remaining.
OK, so, my observation in both games is that the skill of the player and his tactical maneuvering choices was the winning factor in both games, not the presence of a PWT.
Edited by Luddite