Fighter 3rd attack at Level 11 is REALLY good. No question. My first playthrough with Lae’zel as Battle Master caught me off guard at Level 11 because I wasn’t paying close attention to her after choosing everyone else’s spells, etc. - wait, what!?! She gets another attack? Awesome! It felt like a real power boost.
Rangers also get a boost to attacks at Level 11:
Gloomstalker - Stalker’ Flurry - Once on each of your turns, when you miss with a weapon attack, you can make another one for free.
Hunter - Volley or Whirlwind - an AoE attack that strikes a bunch of foes. I’ve heard that Volley is basically shooting everyone in the area of a Fireball.
Beast Master - Bestial Fury - your Companions now get Extra Attack
It can be argued that none of these are quite as good as a Fighter 3rd attack, but they are close enough for me since I was able to enjoy the extra skills and mobility of the Ranger for the previous 10 levels.
