Whilst it's fair to dislike GW2's dungeons, it seems utterly bizarre to say you dislike them, specifically because they're chaotic, then express your enjoyment of Borderlands 2. Borderlands 2 is basically screaming no-tactics chaos writ large. So you dislike screaming no-tactics chaos when it's in GW2, but not BL2? Fair enough, but you understand that that seems pretty strange, right?
The other thing that seems interesting about your post is that you say you play with a set group of friends who agreed on all this, but GW2 dungeons are for 5 people, and BL2 is a 4-player game at most, so surely one of your friends is forced to sit that out, which surely sucks? Either that or you were having to sub in a non-friend for the GW2 dungeons, or just 4-person'ing them?
That's interesting to me, because I tried doing the latter two things in a number of other MMOs, and I found that it made them frustrating even if the MMO was otherwise good. I 4-man'd what, all of Classic WoW up to the max-level dungeons, back in the early WoW era, and boy was that painful and unpleasant. Like you say, it wasn't that we were dying, it was that it wasn't a lot of fun, because it was much harder work than 5-person would have been. Similarly, in TBC I had three friends (two different from before) who I played with a lot, and we often had to get "just some guy", and "just some guy" made the whole experience a hell of a lot less fun (TBC dungeons were less practical to 4-man than Classic WoW ones, I'd suggest, early on).
So if you were trying to do either of those things in GW2, I think that may be the source of your problem, not GW2.
If you weren't, well, I pity your friend who has to sit out when the rest of you play BL2!