I believe I've been to Ulfric's throne room few times, but can't remember why, probably some sidequests take you there as well? I do think I've done the war-quest but for the life of me I can't recall which side I was on, or if it was good/bad/meh.

Usually in this kind of games I tend to do few runs to see each side of mutually exclusive paths, but... well, it's been a while, like a decade according to steam.