Lost's last season alone disqualifies it from being included in the discussion (I liked the finale, but that season has a ton of problems). Battlestar suffers from similar problems, except with a more troubled finale. Firefly really wasn't on long enough to be comparable, who knows what would have happened with 4 or 5 seasons. The Simpsons isn't in the same league as the rest of these shows. Maybe if it ended around season 10, but last time I watched it a couple of seasons ago it was a sad parody of its former self.