Re: Why has Flash been so bad?
Photoshop, Premiere and After Effects are pretty much the original products and are still (Final Cut Pro notwithstanding) pretty much the market leaders. Illustrator used to be like wading through treacle compared to Freehand, until Adobe bought Macromedia Freehand and merged it into Illustrator. Pagemaker was ok with Aldus, but certainly not so afterwards; but then Indesign *sort* of made up for it. Dreamweaver was fantastic if only because it made Adobe trash the truly awful experience of GUI editors - GoLive.
The crock of Trump in all of this is Flash. Under Macromedia's umbrella Flash was actually pretty stable, regularly maintained and you didn't get the weekly 'Flash Installer needs your attention', which to me is the new MS Word paperclip. Since then, well ...
But thanks anyway Adobe: if it had not been for GoLive I might never have gone onto using BBEdit so quickly in the late 1990's..