It doesn't matter if their technology is better than Zemeckis's. The point is, if you're going to do a CG movie, then you should do it with style. The only reason you'd want to use "performance capture" instead of real animation is because you want to avoid stylized movement. That's fine and dandy for special effects since they're not supposed to draw attention to themselves, but for an animated film it's crap. If you're using performance capture with stylized characters, you're ruining it by giving them boring, realistic movement, and if you're using realistic characters then you may as well do it in live action.
I think that performance capture is excellent for special effects, however I do not believe it is a viable medium for producing animated films, and I don't think it will ever be. Perfomance capture films are nothing but showcase special effects technology, and it's not half as entertaining to watch as even Pixar's worst work. At least with James Cameron's Avatar the movie is using performance capture to create creatures that can't be done with makeup. With movies like Beowulf and Tintin though, they're using it because they don't understand what makes an animated movie good. Anyone who has studied the principles behind animation (like myself) in particular are aware of why performance capture films are inferior to the kind of stuff Pixar puts out-- it's stripping animation of the exaggerated qualities that make it worth watching. You can have the actors try to mimic the exaggerated movements of real animation, but it will always look like an inferior imitation of the real thing, and again, what's the point when you can just hire actual animators, who are not only cheaper but deliver superior results?
It's ironic that Peter Jackson, who directed the amazing Lord of the Rings Trilogy, is now backing the 21st century equivalent of the crude "rotoscoping" techniques that Ralph Bakshi used to make his craptastic "animated" Lord of the Rings film. I say rotoscoping in quotes, because Ralph Bakshi's technique was basically a very involved and time consuming camera filter, just like performance capture.