Board Thread:Online Discussion/@comment-142.167.125.74-20150131222920/@comment-86.147.72.112-20150201121341

Only a few dungeons (or instance's) need more than one player to be done most of the game can be done on your own, you will (i think) have to be online though even if your going solo. I haven't played it yet for very similar reasons as you have (and with no sub i will be very tempted too) hopefully someone with experience can give you a more detailed explanation but basically yes you can play it like a classic TES game (you may still see other players ghost's like Dark Souls though).

There's a video thats almost relevant for you here.