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R.I.P. City of Heroes and my 17 characters there
Without knowing approach, playstyle or class choice, not much I can tell you.
A lot of mobs are social so you have to learn how to pull at the right time. Also learn the 'consider' system that tells you how hard mobs are even though it can be misleading at times. 1-2 dots = solo. Anything above depends on your own skill or class you play.
"You are all going to poop yourselves." BillMurphy
"Laugh and the world laughs with you. Weep and you weep alone."