Even after the level cap, I still played. There's plenty of stat boosters lying around. Which gives you an excuse to play. Finding all the goodies. Like the Burnmaster, or the Firelance, or a whole bunch of good stuff. My only regret was that they didn't have a good special Plasma pistol. But fun with the Blackhawk is fun.
And it never gets old to watch a SuperMutant do a headless backflip.