Half of the abilities and one talent tree is exactly the the same, not to mention the story. It can hardly be called a different class (as in WoW some people said you can't change from paladin to warrior... those are entirely different, nothing in common whatsoever!).
AC change would offer some more content at lvl50. I would even pay like 5 euros for that. Since there's not much to do with my vanguard that's only good at tanking in pve (as opposed to commando which is viable as a tankheal or ranged dps aswell) and only one tank is needed even in operations.
Reroll would be nightmarish, I don't want to do the same story q with half of the same skills, same companions, same grinding. 5 days played wasted.
If there was arena I wouldn't care of the pve aspects and this whole issue wouldn't matter