Oh the stereotypes.
Because there is senseless violence, only a young disoriented mind could do it ! Cue most adults, a large part of them with children, in the occidental world who watched Machete, Hobo with a Shotgun, Tokyo Gore Police; who bought and played Mortal Kombat, BulletStorm, Doom, Grand Theft Auto, Manhunt, God Of War, MadWorld, Silent Hill or Dead Space !
The scenario is but an excuse for a display of maiming : so what ? That's a genre. There are people who like watching that, and there are people who like making that. Who are you to treat them with such condescendance ?
From a technical point of view, the animation itself was good, the lipsync was fine as were the voices. While the choice in camera plans weren't that original, and the humor wasn't subtle, both were enjoyable. Overall yes it appeals to your basic instincts, but it's good.
Plus, not a ad hominem argument here, but looking down on people is usually a sign there is something wrong within yourself. For some, publicly judging something or someone else as valueless helps them feel more valuable because they suffer from such a horrible opinion of themselves. Moreover, their view gaining public approval is a sign they fit in better than they thought an helps how they feel about themselves.
I'm not saying you can't criticize something without being emotionally unstable, of course.
Though your arguments are shallow indeed.