It's not the ending that matters, it's the journey. I didn't really even like Morrowind's ending that well, to be honest.
I'd like maybe 2 endings, 1 would be fine with though, but many ways to get there. If there are multiple endings, I wouldn't care if it were a canonical ending or a Warp in the West scenario again.
Also, you should be able to play after finishing the main quest.
That goes without saying. This is TES, not Fallout.