Following Yoshiyahu's advice, and reposting my remarks minus the "Armor 3 X-wing" thing...
The whole point of arguing about the TIE Defender is specifically on account of established canon, hence my stated desire for insight as to what FFG had in mind for what the TIE/D should be since it seems wildly divergent from others' expectations such as the aforementioned "Nemesis ship", which is where people in this thread get the "underpowered" impression from.
It's one thing if FFG and players share a "design intent" and then the released stats just don't match that common intent, it's another when they're seemingly going (and thereby players judging "overpowered or underpowered") on very divergent criteria.
Basically... what's up here? In the sense of why is it that the TIE/D Defender is actually worse than the TIE/LN both maneuverability-wise and speed-wise (in the latter it's also worse than the X-wing), much less the TIE Interceptor? Moreover, in return for its armament (two more laser cannons than a Y-wing) it's only a single-seater so it's only got a pilot who can take actions, whereas a BTL-S3 Y-wing's ion cannons are gunner-controlled and Fire Arc All, making the Y-wing more versatile in that sense, to say nothing of the astromech socket... seems like under this ruleset, a two-seater Y-wing can just plain "do more".
TL;DR : If this is somehow "working as intended"... then what's actually intended? Because it certainly doesn't reflect many players' impressions of what the TIE Defender is "supposed" to be lore-wise and how they would be utilized.
Edited by Chortles