I got hold of a key for ESO on Friday and installed it yesterday. If you like the TES games (which I'm quite sure you do) you'll love ESO. It even takes some of the best bits of Guild Wars 2 and mashes it in there, together with a fairly open skill tree (as is the case with TES games). It also feels more polished than most other MMOs.
I'm actually hoping they include many of the game's features in the eventual TES / Fallout sequel.