Alright, the final boss can suck it as a pet class. I was warned, but surely it couldn't be as bad as everyone made it out to be. It was an absolute cluster. I was only level 51 at the time, but that seemed appropriate. The main problem is that, while only one pet could attack, the pet would constantly disengage when I was running around like a chicken with my head cut off avoiding tentacles and voids, etc. The other issue was the amount of damage that was able to be dealt to my pets. Couldn't keep some of them up very well. I wasn't going to be off put though and got him down after around 5 deaths.
I think I could have distributed my points a bit better. I went mastery heavy to try and get it out of the way, but sacrificing 10 - 20 points to get a few more levels in Curse of Frailty / Vulnerability probably would have helped a fair bit.
Going to start Elite and see what happens. I feel like if I can handle everything fairly easily except the last boss I am doing alright. I did pop in to Elite Act I and kill a few champions, they can sure take a beating.
What does 'stop while progressing' mean? Basically, don't grind out levels in Act I Elite and flow through naturally?