I don't have any problem with who the hero is per say. I thought she was fine. Decent enough actress as well. As others have pointed out, how big or tough they are isn't the determining factor anyhow. What robbed it of a little gusto imho is that in other installments, they are literally gunning down on this beast with ordnance & automatic munitions to the extreme, in order to even get a speck of blood from it, which seemed like exactly who these predators hunt, for that very reason, their badassery in warfare... & in this movie it's picking on people with bows or axes, & doing only about as well. It's just a bad look for this Predator. Even worse is WTF it's hanging around doing here in the 1st place, hunting wolves & snakes etc...
This thing kills alien xenomorphs, man. I just can't get excited it killed a wild dog chasing a bunny... or even that bear. A bear? So what?
Again, the characters were fine. Interesting even. The Predator itself though? Comes off as a punk ass imho lol