BryonD
Hero
IME running a pregenerated campaign at a level I'm satisfied with takes at least as much effort as building my own. You can run a module or AP at a C- level with pretty minimal prep. So it most certainly can be done.I agree with this. Running a pregenerated adventure doesn't eliminate the preparation required for a game. It does vastly cut it down, IME, but does still leave quite a lot to do.
But if you really want an A+ level of experience, the dedication it takes to know someone else's story at the level a good DM(*) should takes more added time than having the pre-built stat blocks saves.
(*) "good DM" is per my own standards, YMMV, of course.