The main problem, and the only problem with this movie is the suspension of disbelief. We are talking about video game characters after all. How hard or how easy is it to root for a video game character? How likely are we to believe that a video game character could have a personality and feelings? On the other hand, how believable was Toy Story? In that movie we were expected to believe that toys could have personalities and emotions. The story of Wreck-It Ralph is really not much different than the story of Shrek in that an unlikely hero goes on a quest to do something good. It also shares qualities with Alice in Wonderland. What Toy Story and Shrek had going for them was a combination of great characters, interesting villains, great animation, good humor along with some interesting mythology. Wreck-It Ralph has all of these characteristics in spades although not quite at the same level.
Rather than depend upon a wise cracking donkey for humor, Wreck-It Ralph gets its humor from pop culture references, mostly from classic video games. This is one place I fear that movie might go over most people's heads, as not everyone is familiar with 30 year old video games. I wonder how many people under the age of 20 have heard of Q-Bert or Qix? There are a ton of 1980's video game characters is in this movie, but I happen to love classic video games. So humor is the one area where the movie could have been a little bit better. What Wreck-It Ralph lacks in humor it makes up for with good characters and story.
I am impressed that the Konomi Code is part of the story. (Talk about your pop culture references.) There is a point in the story where King Candy uses a cheat code to hack the computer program of the Sugar Rush video game. This is a pretty interesting scene because it is portrayed as going into a deep vault with thousands of connecting pieces of computer code. This serves to remind the audience that videogames are after all computer programs.
With the fast rate at which technology is advancing, maybe someday computer video game characters will actually be smart enough to have personalities. This I find easy to believe. The trend has started. Already I can have a primitive conversation with my iPhone.