No, not really. I kind of feel the same, but I still realize this as a money scheme.
/facepalm
Its an RPG for Christ sakes it should not have one ending.
Ok, where the heck does that idea come from? The vast majority of non-tabletop "rpgs" I've played had
one ending - you beat the final whatever and won (or you died and restarted from your last save).
(and for the record - I've been playing computer & console RPGs since 1979. Started with Wizardry 1 and Ultima 1.)
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My answer - I had no problem at all with the original FO3 ending. I'd made a save just before the final mission, went through with it, saw the final movie.... then reloaded my save, turned left and wandered off to explore. 50+ hours later, I loaded up some mods and made a new character. (Never bothered with "remove the end" or "level cap increase" mods, there was no need for them. The original ending and the 20 cap were perfectly fine.)
While I did eventually get BS, I'm not all that fond of it. (And I only got BS and the Pitt. Other three didn't seem compelling. And I had to get the Pitt because I live in Pittsburgh.
)
When I get around to my next modded playthrough of FO3, I'm not planning to bother installing the DLC.
And I *really* hope they don't do a BS-style DLC for FO:NV - the level cap raise screwed up the game balance and the "tougher" bullet sponge enemies were just annoying.