Feathers don't have to look dumb. No one looks at an eagle and thinks thinks the plumage makes them look any less fearsome of a predator.
I'm perfectly happy that the Jurassic World dinosaurs look the same as they do in the other movies - like Omegazilla said, they are iconic movie characters. Less excited about public perception of dinosaurs remaining unchanged. I go to a fairly "prestigious" math and science high school in my city and I had the utmost difficulty convincing a friend that dinosaurs evolved into birds, of that a whole bunch of them had feathers.
He also could not wrap his head around the idea that any of the plesiosaurs or pterosaurs weren't dinosaurs, though I am expecting a scene in Jurassic World where someone calls the mosasaur a marine dinosaur, and a scientist character corrects them. That would at least be one prehistoric animal misconception averted.
In a world where Gravity or Interstellar get analyzed so much for the quality of its science (hi Neil), I do feel dread for what Jurassic World is going to face.