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PDF is a legitimate e-book format for anything that is not basically text with formatting (technical books, scans, magazines, image books...). Right now nothing convenient can deal appropriately with formulas, diagrams and the like.
Latex can do it, but it's even trickier than pdf, so pretty much all science communication moved to pdf from latex.
DJVU can also do it and it's technically better as far as I know but it never took off and has patchy support.
For text based books (fiction) pdf is nice for pc reading, printing..., but not really for mobile reading devices.
However since technical books are still books, pdf is definitely a legitimate format.
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