I hate the stupid rpg stats systems that are in every LN/WN and their adaptations now. Completely annihilates suspension of disbelief. All it does is allow the mc to become absurdly overpowered in no time at all so they can rush straight to the self insert mary sue fantasy. Absolutely no effort is spent holding up the fourth wall and yet it seems to completely lack self-awareness.
Oh and take a shot every time you see a series with the premise: guy was kicked out for having "useless" powers turned out to be super op. It's a cynical way of preying on people rejected by their peers. So they can feel their rejection was unjustified and fantasize about becoming someone special and being surrounded by people who appreciate them. Then they get all the girls and rub it in the face of their "bullies." Blech.
I understand why a lot of people like these even if they're just copy and paste over and over, but to me it just feels patronizing.