Yeah, I loved the feeling of exploration. I liked the depth of crafting. I really enjoyed the stories attached to the dungeons I've run (which is absurd to me, as I generally dislike dungeons), and am looking forward to how that story progresses at Veteran rank.
As far as user-generated content? EvE's user generated content is based primarily on the drama of holding and taking over swaths of empty space. Oh, and they've got a damn good market system. In the end though, EvE is still a sandbox game because it lets the players go where they want and do what they want, something every Veteran in ESO will be able to do.
Oh, and there will be some conquest in Cyrodill, though that isn't nearly as persistant as EvE (thankfully, because 0.0 stagnation is a major flaw in that game, even if it's simultaneously it's biggest advantage over every other game out there).
I've also got my card played that I like what the developers say in their blogs, and the reasoning they give for their decisions. The API call and explanation. Now the expansion of detail on their view of end-game, specifically the non-gear-driven focus. Hopefully they stick with their guns and expand on what the game is. IF that's the case, I'll be here for a long time.
If not? I'll try the next game out there until some developer actually gets the balls to go full sandbox again.