City of Heroes/Villains. New content for the full range of levels, AND quality of life improvements all the time, plus the designers actually care about the game and its players, unlike those of certain other MMORPGs who are mainly concerned with luring in new players and keeping the max-levelled ones playing forever despite the fact though it's too much of a pain in the *cough* to level up another character or two to the point where they can go someplace interesting! ^-^