I loathe web apps. They're crap. Just horrible. Well, 99% of the time.
I found (and paid for) an app that isn't total garbage and is actually usable. A Relatively Decent Web App (uber niche)
Sierra Chart has a lot of better functionality, and beats this by miles, but last I used it doesn't have trading ability.
Anyways... it is *possible* for a web app to not "totally" suck donkey gonads.
Still... Doesn't measure up to desktop quality, but not totally horrid.