Sure, I'll give you that! Though I do think any semblance of any kind of seaside/nautical theme was done away with when they did the big renovations that saw the removal of the Maliboomer, Pizza Oom Mow Mow, etc. There really hasn't been much of a unifying theme other than 'pier' and the cheap late 90s quality of the remaining opening day stuff like Ariel's Grotto, the carousel, and CS station are pretty jarring compared to everything else that's been spruced up.
While I can't really defend either project and think other choices could have been made, I think people do seem to have unrealistic expectations though of some kind of elaborate reasoning for why attractions exist on a pier though. None of these attractions really provide opportunity for much immersion. So in the end you're either left with the generic (i.e California Screamin) or something the company can tie back to something people have a fondness for. Whether it's Mickey, Triton, Incredibles, or Woody, the limitations of adding any kind of character/story will be the same for all those attractions.
No one had this type of criticism when the Orange Stringer became Mickey's Silly Symphonies or Mickey & Friends were added to the Fun Wheel or all of a sudden Goofy had a Sky School (even when there was already an aviation themed area already in the park no less). I honestly think that forum dwellers have some kind of resentment towards Pixar for any number of reasons... it was an acquisition, it's been too prominently featured in the parks, etc. Us older grumps write off the fact that there are now generations of kids who have grown up with Pixar as their Disney and have more of an affinity towards those characters than Mickey & Friends.