ESO remains a hodge-podge of great and terrible things about The Elder Scrolls as a franchise. Its Summerset expansion brings a relatively interesting new locale and suite of abilities, quests and group activities but improves little on the technical side. Its world can envelop for brief periods, but there is usually some hiccup lurking just around the corner to ruin your time.
Source: N4G PC State of the Scrolls: Has Summerset made it worth jumping into Elder Scrolls Online?