Wreck-It Ralph is worth seeing in the theaters, especially if you good memories of arcades while growing up as a kid, or even if you have kids you want to drag along. However, feel free to skip the 3D showings and save yourself a few bucks. Unlike Despicable Me or Monsters vs. Aliens, the 3D for Wreck-It adds nothing.
Despite the non-use of 3D, Wreck-It Ralph is exactly what I expect and want out of an animated movie. It's big, bright, and gorgeous while telling a story that both kids and adults can enjoy. Ralph is the classic tormented bad guy, someone who is seen as evil because of circumstances rather than his innate nature, and dissatisfied with his lot in life. It's this dissatisfaction rather than circumstance that kicks off his game-hopping adventure.
This is a well written and voice-acted film, a point made much clearer to me since I decided to watch Exosquad, a cartoon from the late eighties or early nineties, before going out to see Wreck-It Ralph and the contrast is extreme. I'm glad to see animation getting the recognition it deserves and drawing in much better talent in both acting and writing.
As I said the writing in this film is spot on. A prime example of this is the term "Turbo". It's used a few times in context by characters who know what it means before finally being explained. The audience gains an idea of its definition but the full scope of its meaning, the sheer horror it represents, isn't fully revealed until later in the film and is done such that it doesn't feel like a gratuitous infodump. Additionally, there are twists that were foreshadowed but still ended up being a surprise, and emotional moments that tug on your emotions in ways you didn't expect. The same set of words is used twice in the film, once for comedy and once for pathos, and both times they fit.
Again, I really do recommend going out and seeing Wreck-It Ralph, especially if you have kids or know people who are kids at heart.