City of Heroes, you can look up a randomly-generated mission via the newspaper or police scanner, dart off to the location, and most likely have it cleared out in fifteen minutes. A tank in World of Warcraft can log on, set themselves up via the dungeon finder, and often be done with a dungeon run before they finish their favorite episode of The Office. It's a far cry from a Dragoon in the heyday of Final Fantasy XI sitting in Jeuno for three hours without a party invitation. Say what you will about grinds, but the barrier to accessing content has never been lower.
The ability to pick up and immediately get moving in many MMOs has become quite a selling point, but there are players who feel that it rewards quantity and almost hyperactive runs through content rather than depth of play. What do you feel about systems to let players jump in as quickly as possible? Is it a major selling point you'd like to see more of, or a growing weakness that's turning persistent worlds into glorified lobbies?