Well...
I think that the BJ isn't that powerful...
If you see someone with a beam, dont just swoop to him like a naab >_<
If you swoop to someone who has a big Kamehameha in his hands... sure you'll die...
lol ! Yeah it's a way to go out of the fight to reload, and it's quite nice !
Why are you slowing it ?? It's kind a great move and, even if it's look impossible to counter, there are ways! try charging a beam and fire it on the guy who is beamjumping...
The beam can follow and destroy him, if you know how to aim.
Or if you are quite near of the guy charging the beam, try advanced or old melee >_< before he shoots.
But sure it's quite powerful...if someone is stupid enough to go into your beam...
Swooping to a guy charging something is not truly intelligent see >_<, exept if its before he can shoot !
(yeah and sorry for my bad english, i'm quite french you know >_< )