Played this for a few months after a year or so break.. its great fun but like all mmorpg it is repetitive
And for myself i always need a goal in such games, but once youve levelled everything you want, got the gear you want etc then theres a lot of moments where your stood around wondering what to do..
I would say for anyone playing everyday and really enjoying the game then 'ESO plus' is a must.. it gives you access to all the DLC, double bank space and a crafting bag among other things
@Zom as kiyoshi said that is just the base game, unless it is the gold edition.
as for DLC the top ones are Orsinium, thieves guild and dark brotherhood..
The imperial city one is PVP based and theres another one that just adds a couple of new dungeons
What i suggest is, if you find yourself enjoying the game after a while then i would buy 1 months of ESO plus, which will give you access to all the DLC mentioned.. except the new morrowind which is considered an 'Expansion' not a DLC