This thing is hooked directly into my own farts.
It's not enough anymore in a ghost story that you died horribly and your spirit is unsettled, like in The Sixth Sense -- you just need the magic of Haley Joel Osment to settle your hash, and then you and Patrick Swayze can move toward the light. Oh no. Now someone spends 80 minutes figuring out that, in life, you were forced to stress-test dildos until your hands chafed raw and so they have to burn down the old abandoned dildo factory so that you can rest in peace. Then they spend the final 10 minutes dealing with the fact that the dildo factory was actually holding you safely away from the good people of Dildonia and now you're going to go slaughter innocents en masse because you're just a prick. Up yours, ghost.
Vengeance is a fine motivator to do something awful in a horror movie, especially if you're no longer bound by the shackles of mortality. But damn, doesn't vengeance have a point? Getting revenge on everyone everywhere is just arrogant and douchey. Plus, when you're done, and everyone is a ghost, who do you think won't be hanging out with anyone ever? You, you dirty douche ghost. You'll have eternity to be pissy with no outlet because all the other ghosts will hate you for killing them.
What Can We Do?
I don't want to come out and say have your ghost not be a dickhead, but maybe give it some dimension. The problem with too many movie villains is they're flat evil. Who the hell is just evil for the sake of evil? Not even Tom Cruise is like that. Give them some depth, a reason to be pissy and a reason that they may want to hold back that pissy attitude sometimes. And maybe your twist ending should not be the same twist ending in every single other movie that was made this decade, maybe try that.