They turned it into a completely different show (spoilers)
and I'm not entirely sure if I like the new show.
William spent all but 2 episodes being completely pointless. The episode of his "treatment" was awesome, and the finale was cool.
Delores... It took way too long for her plan to make any bit of sense, and I spent so long rooting against her, that I didn't care about her death.
Bernard could have been omitted from season 3 and nothing would have changed.
Maeve's motivation was flimsy at best, and every time she used her superpower it felt dumb.
Shedding all the minor character was a horrible idea, especially when half the ones we *did* get were actually just more Delores. This is the biggest failure of season 3. I like Aaron Paul's Caleb, and Serac was a good villian at times, but every other new character spending any amount of time on screen was a waste. Why the 17 was Marshawn Lynch in there?
I guess season 4 will be mid- or post-breakdown of society, with Caleb leading the mob, Charlotte-Delores with Host-William leading a host army, and Maeve leading some other faction? I'll watch it, but I'm not excited about it.