Well, as to rotoscoping, there’s some of that in Disney — and Don Bluth — and Bakshi — and Heavy Metal — and “He-Man” — and I’m not going to be one to say that a technique is enough to decide that an artist is a “hack.” I have no opinion on Bakshi, having never seen any of his works.
As to Pixar: so far in 8 tries (not counting just-released Wall-E) they haven’t made a feature film that has grossed less than $350M worldwide, with their highest $864M (Finding Nemo). Their average is $539M). Three times they have won the Oscar for Best Animated Feature.
Compare that to Dreamworks Animated. They’ve released 5 animated films (never made more than $218M, average $124M). There are also 9 Dreamworks CGI films, not counting Kung Fu Panda which was just released; of the 8 already released, only 5 managed to make it past that $350M mark. Their highest is $920M (Shrek 2) but the average is only $486M. They have won the Oscar for Best Animated Feature only once for their own production (for Shrek, and another Oscar for Curse of the Were-Rabbit, which they distributed for Nick Park during a year when Pixar released no features).
So yes, it’s very fair to say that Pixar is a successful studio who manages to do a few more things right than the average movie company. You might not like any individual Pixar film, but it can’t be denied that they haven’t had any clunkers at the box office, for whatever that proves.
What makes Pixar different? I have no idea. Generally I think of animation being such a time-consuming process, where even a shot of a few seconds might take days to arrange and perfect. This means that in the right environment, with the right creative atmosphere, you have plenty of opportunities as a filmmaker to correct any defects in lighting, color, humor, character, design, or plot. Pixar seems to embrace those opportunities to polish its film, to correct its defects; perhaps other animation studios are more interested in meeting deadlines and pleasing shareholders?
DreamWorks Animated has released 16 films since 1998 (not counting new Kung Fu Panda) and send 1 film straight to video; Pixar, only 8 films (not counting new Wall-E) since 1995. Dreamworks (a publicly traded company) appears to be designed to crank out at least 1 film per year on a schedule; Pixar appears to be geared at releasing a film when it’s done — I can’t tell if they are on the NYSE or not.