As an MMORPG, yes its worth it. But it does depend on your taste in games and some personal preference. ESO is an MMO, it is not a single player RPG like skyrim, not a sandbox MMO where you can build anything like minecraft, and not a gore and sex infused game like other M rated games like the Witcher. Carrying the mantel of a TES game there are a lot of preconceptions that you need to break down and look at the game for what it is, an MMORPG.
What it does well is telling stories, letting you explore the TES lore & realms, questing by yourself & with others, achievement systems, challenging dungeons, 12 man raid trials, open world PVP, a reaction based combat system, no/limited global cool downs, a simple but rewarding crafting system, stealing and & killing, first person mode, open ended classes, werewolves & vampire options, and alternate achievement trees that span across characters. Being an old school gamer of MMOS from Everquest, Asheron's Call, Dark Age of Camelot, Warhammer Online, Guild Wars 2, World of Warcraft (some), and many other MMORPGS I can say this is probably one of the most complete MMOs out there for content and mechanics. If you really try and play the game and get into some quests, exploring, stealing. Dungeoning, or PVPing, you'll probably find yourself spending a hours a day (if not hundreds in a few months).
There are things to improve on however, but change is on the horizon. Currently there is no player housing, no instanced tiered PVP battlegrounds, no dueling, there can be a lot of lag in large scale PVP battles, few tutorials on certain mechanics to the game, a few equipments sets have little pupose, some skills are not useful, and there are some annoying persistent bugs. Being a constantly changing game a lot of priority issues, based on the stability and player majority, have been corrected, mitigated, or tweaked. Also in their road ahead presentations, ZOS has recognized these shortcomings and has shown plans to address most in future patches and DLC.
With it going buy to play with convenience and cosmetic items (now pay to win equipment shops) this is probably a good time to get in try it out. If you like it, new DLC and content will be coming in the next few months, probably around console release, so you'll have time to get to end level. If your still on the fence, check out a few
youtube videos or
twitch streams to get a better idea.