With HP, you have to sit around in hospitals for weeks to get back to full strength.
This is not completely true. With medical assistance and surgery, you can heal damage much faster than in Standard D&D.
Oh, and don`t forget: If your wound points are up (at least in Starwars), you`re dead, and nothing and nobody can help you now - just roll up a new character. And losing all your wound point may be caused by a lucky (read: critical) hit - you do not even get a save against it...
If you fail your massive threshold check, you are at -1 and dying. Even if you reach -10 and die, a field medic might be able to rescue your life if he is not too late there. (hope there is one in your group, or you have a DocWagon Superplatinum contract
)
A very interesting difference between these systems:
Once you begin losing wound points (be at through a critical or because your vitality points are up), you might become weaker (I believe Starwars made you fatigued in this case), but you can still act. This might allow you a retreat, but since you still act, some enemies typically decide to shoot you anyway, just in in case.
In D&D/D20 Modern, if you are at 0 or fewer hitpoints, you begin dying. You can`t retreat (well, at 0, you still can try it), but since you fall down, most enemies tend to ignore you, giving you a chance to stabilize or being healed ...
I thing the D&D/D20 Modern is better, though it might prevent the characters from attempting a retreat.
Mustrum Ridcully