Wouldn't you have to include Shrek in that grouping as well?
For the record, I think Shrek's humans have absolutely horrible character designs - I swear, in Shrek the Third, I cannot tell the princesses apart at all. And the hell of it is, DreamWorks has "cartoonified" their character designs a bit since 2001, but the Shrek series is stuck with these awful designs from the early part of the decade when nobody knew how to do convincing human characters in CGI yet.
You want to see human characters done right in CGI, look at The Incredibles or Ratatouille or Up. All those characters really look like they existed first as hand-drawn characters and then were rendered on computer. With DreamWorks, it looks like they just grab their humans out of some stock character program or something.