It depends on how it's depicted. Is it comedic violence such as Miss Piggy hitting Kermit or Gonzo or someone else, or any sort of physical, slapstick sort of comedy? What about comedic violence in what were originally theatrical shorts, like Tom and Jerry or Looney Tunes (very violent bunch of theatrical shorts if you think about it)?
Is the violence condoned? Think of any non-military portrayal of the happenings of World War II, like Swing Kids, or To Be or Not To Be (
http://www.imdb.com/title/tt0035446/), or Schindler's List. These movies I would say were definitely opposed the violence that they were depicting (I haven't seen Schindler's List, but I rather doubt it would condone that which it depicts).
Then you've got your horror movies. Those I certainly would not show to any impressionable minors, and I have to use discretion in watching them myself (although I am a big fan of B-movie horror, the violence of which is hard to even take seriously). Action movies like Terminator (any of them), the Punisher (I found that movie's violence shocking and emotional, I couldn't handle it), or any of the others, I have to use discretion and consider who is watching it or what the movie's position on the violence is (I think how often I watch movies is becoming obvious in this post).
In thinking of a movie's position on the violence, one has to figure in The Passion of the Christ. That was a terribly, incredibly violent movie, but that violence was neccessary for the movie's message and effect on the viewer (this movie's violence was neccessary for depicting the means for the world's salvation).
In short, the acceptableness (is that a word?) of a movie's violence has to consider the movie's position on the violence which it depicts, or rather its motivation for showing the violence.