Whatever the role of the Enclave is it's smaller than every other faction in the game. There's been zero talk of the enclave as a faction in the game. That eyebot and the old APA is it. Maybe they'll just throw a tiny bone to the FO3 tards who drool over the enclave and think they're soooooooo...
It'll be a hard game to spoil. They have to spoil the main quest 4 times, and then the 70 sidequests. Quite a task for a troll to accomplish, but possible.
I doubt it's even possible to have a perfect ending in any situation depending on how you look at it. Butchering every faction and taking over doesn't look that positive.
Meh, it's better to just run out of there as quick as possible and steal the key or use speech. The XP you get from there isn't much in the long run anyway.
I agree with that mod article. Time and time again you hear "hurr durr dis a expansion pack/mod". Expansions don't have more content than the game you're calling it an expansion of, New Vegas will as did Fallout 2.