Scoundrel is at least wayyy better than the rogues were in DOS1. DOS1 rogue was garbage IMHO.
Depends if we are talking about EE or not.
They definitely had issues. For example the game was OVERWHELMINGLY biased against Rogues as not only are almost ALL of the legendary gear not melee dex weapons but because of their limited gear you would gen it very infrequently.
I hear you could get them to broken levels of damage, but I've never been able to pull it off.
Now, if you could get your Rogue to a high enough level BEFORE EE... They became a dreaded CC machine! (and get them a point in Marksmen so they can have two charm attacks).
Though EE actually kind of took that away... Losing most of their utility as many of their best moves were removed AND the number of skills they could learn became much more limited (and they NEEDED every skill they got because of how excessive their cooldowns were). The best thing to come out of EE though is their Airwalk ability being a 0AP skill.