The key to making it enjoyable is being able to self-direct your game go exploring, hunt Raiders or Gunners for loot and XP, re-attack a place for style-points and useful junk, build a public-works project for your Settlers, set goals for yourself like acquiring a specific weapon or earning a particular amount of caps. Garvey seems to incurr), the side quests have been plenty of fun, and I still have the Main Story to complete as well as the DLC.
My settlements still get attacked (though not without the legendary frequency Mr. Playing in a sort of freeform manner has been plenty of fun. Likewise the BOS, those creepy Covenant cats, and now I'm going to poke around C.I.T. Met a dude named Valentine, learned a few things and then walked on down the hall. Took a few gigs with the Railroad just enough to learn how to make some cool threads, and then I walked on down the hall.
I toook the free musket, killed the raiders and the Deathclaw, and then I walked on down the hall. I've played to level 85 without following the main story and have no regrets.