I think the videogame characters were fine, they were there more like to give authenticity to the ambiance, pretty much like the original toys in Toy Story: you could see toys from Playskool and Mattel, but they didn't just spread them all in your face instead of giving an interesting plot with great characters. My personal favourite? Q*Bert, he's not a main character, but damn, he's the only licenced character with a personality perfectly developed, and he's so adorable I made an artwork of him:
I'm also VERY glad that they made cameos of retro characters like pacman, tapper and the chef from burger time, instead of overvalued nowadays characters like Master Chief, Altair and Sora from Kingdom Hearts... it's a movie about arcade games, after all. I also had a chance to watch the latin american dubbed version, it's decent... Looks like they improved the voice of Zangief and made him sound more russian... the only problem is that they hired an old mexican comedian to voice Vanellope just because "everybody loves that comedian"... gosh, she sounded like a granny, and her voice acting was annoying as hell.