Having gotten 45 potions in Commonlands, I can explain a little about there. All Orcs except the pawns are included in the event, with Defilers being the lowest, then Hunters, Killers and finally the named. Potions do drop off all of them but the drop rate is higher on Killers and of course the named always drops 2. As for exp, don't plan on gaining any because all of them are grey cons to level 80 except Killers which are green and the named, who is LB.
Expect to be hit in the 300 to 750 range by Defilers, 300 to 850 by Hunters, 500 to 1200 by Killers and up to 1800 by the named. None can be charmed as I tried over and over, all but named can be snared by a ranger for sure. They seem to have an expanded aggro range including the named who I've seen charging at me from a long way off. The named enrages and casts AE's of some type...I never took the time to see what it was. At 20%, the Killers seem to hit harder but its not enraging. I never died to any but I've seen many players who did as they weren't prepared for the hard-hitting.
They ALL summon...even with MQ2NoSummon, I get summoned quite often. I turn on NoStun2 (they're Orcs and always stun), NoMeleePush (my war was getting pushed like crazy until I did) and the NoSummon for what help it does offer.