The first main story boss fight is (still) a giant pain in the ass/unfun as melee, unchanged from beta 1, and just like in the beta, really soured me on things, at least as a melee rogue.
Having to dodge multiple rounds of energy-bola-spam, avoiding the connection links from the boss to the 'minibosses' she spawns, and the enemies all teleporting/flying away at random intervals in a tiny-ass space, complete with aoe columns randomly firing off making you unable to do any actions, and each hit giving you the 'take more damage' debuff is super, super-unfun.
Died once, beat it on the second try, but just....not at all enjoyable.
Especially if you don't happen to have specced into a bunch of mobility options/dots, or have a legendary that increases mobility via new skills or dodge # increases.
I imagine it's still easier as a sorc or necro for just having your summons do work and only having to run around dodging beams, but....ugh.
I just hope that's the only real 'boss' in that vein of being immune/add spam, though given the game's potion system limitations....I kinda doubt it.