The boss situation itself, I have to agree. Some enemies and the boss and you can take the other out first in some way seems ok and doable. Yes.
But when the game, like right in front, on the way, to the burning building, puts you 5-6 opponents in your way, or right before the boss in that area before the river, that's what I call unfair or an design flaws, cause that's not how the game is intended to be played, against 4-6 people at once and on the cliff on the way to the house, you almost have to run into that group before you even can notice them. That's bollocks.
Sure you can run past them, specially the area before the boss, but that doesn't feel right, if the game gives me a so direct way to avoid them, the roof there, then that's a design flaw. It's so shit that the game itself gives you a way around.
And fighting against so many is just not fun in this game. Picking them singlehandedly out of the group isn't fun either and cheesy.
So, what is it then? Bad. Simply, bad.
But yes, the boss area specifically isn't I agree.