I'm the archmage and I'm still running around collecting lost alembics.
I'm the guild master of the thieves guild and they still talk to me like I'm some newblood.
If that's not immersion-killing I don't know what is.
Its better then in Morrowind when after you beat the quest-line everything suddenly stops.
Besides that no one MAKES you do those things, and both members of the thieves guild and The college make frequent mention of my leader status
Well, seeing as Skyrim's Factions are nothing more than glorified side quests that anybody can do, it is safe to say they are inferior, or rather, the faction system is pretty much absent.
you mean like Morrowinds guilds that anyone could get through by paying a master trainer some paltry sum to level their skills?
the level requirements were useless as ANYONE could get past them with ease.