Jumps, as they are, are not difficult to use even if they leave you open. You simply have to pick and choose your moments--and that is not a difficult thing to do (so far in my experience). Though, I can see how many could view that as annoying.

My problem with Jumps is that they are boring. They're just another off-GCD ability. Blah. If they had invulnerability frames of some sort, they'd have an interesting element to them.