I'm a big Pynchon fan, too, so don't get me wrong here, but it seems to me like the main difference between Dick's writing style and Pynchon's--or at least, the difference that mostly accounts for Dick being treated as a "pulp" author with some interesting ideas whereas Pynchon is considered a major "literary" figure--is simply that Dick tends to write in crisp, straightforward sentences that just directly say what he means to say, whereas Pynchon's writing is (in)famously dense with allusion and rambling esoteric figurative expressions to the point where it can be an intellectual exercise in its own right just trying to figure out what the hell Pynchon is trying to say.
All of which makes major Dick novels like “Do Androids Dream of Electric Sheep?” or “Radio Free Albemuth” sort of resemble, IMHO, what “Gravity's Rainbow” might have looked like if Pynchon had been working with editors who expected him to actually keep tight deadlines.
I think Dick was really gifted as a wry satirist, too, and this is something I think he's often under-appreciated for. Probably my favourite single episode in all of Dick's stories I've ever read--and I was quite overjoyed to see this faithfully recreated in the film adaptation--is still the "suicide" sequence from “A Scanner Darkly”. In short, I don't think Dick was ever bad at writing--he just doesn't seem to have had any real interest in the kind of writing that people like James Joyce or William Burroughs (or Pynchon, for whom to my mind it seems that both Joyce and Burroughs were major stylistic influences) were famous for.
If you're into SF, read on.