Pugilists are actually pretty decent off-tanks. Meaning you're used for things like pulling an enemy off a group and holding it for the party to kill, while the Gladiator tanks the rest of it. Or in the instance shit hits the fan and your Gladiator goes down, a Pug can tank in a pinch though it can sometimes be close. I can say this because I've done this and honestly I'd say they shouldn't be main tanks ever if possible. They have the least native tanking abilities of the "tank" classes.

As far as DD goes, it depends on how many targets. Archer and Lancer obviously have it beat in terms of raw damage in both situations. Now the spot for 3rd really goes to Pug in a 1-on-1 fight though in groups they will really fall behind Marauder. Reason being, a properly positioned Marauder can hit the entire group so while each individual hit may be less or even on par the damage adds up to be more over all targets. Not really addressing the mage classes though, just looking at other DoW. Judging by Peregrine's info (if it's accurate) Pug would be dead last out of the DDs in a large group fight.