I do a shield lob on one or two depending on how far they are, get them all together and do a flash, then tab target doing the SB -> whatever the enmity combo thing is. I'll watch the threat meter to see which targets have the highest threat from everyone and do a full combo on it, then just tab target combo the rest of the time, while throwing in a flash every so often, but not too often so you don't get the diminishing returns of blind. Haven't had issues yet, but I also play in a group of 3-4 where if we have to pug 1 person, it's a DPS so everyone knows their role. I HAVE done pure pugs w/ 3 other new people and still haven't had issues, so I don't think we need more aggro / more skills, we just need players to increase their skill level.