Well, like any MMO it has its pros and cons. I know you're already playing it now Krampus, but for everyone else, I'll spell out what I think is good and bad about the game.
Pros:
-Graphics. It's one of the best-looking MMOs I've played. It has the usual attention-to-detail you'd expect from an Elder Scrolls game.
-Lots of PvE content. Between the quests, open-world bosses, solo dungeons and group dungeons, every map has a lot to do. Skyshard and lorebook hunting is also fun.
-Mass-scale RvR. A spiritual successor to games like DoAC and Warhammer Online. Cyrodiil is expansive and there's lots of room for different playstyles (solo roaming, small group roaming, havoc groups, zerging, etc.)
-Lore. It's the Elder Scrolls universe and the game does a good job immersing you in its lore with its quests, lorebooks and dungeons.
-Complex crafting system. If you like crafting, this game has one of the most unique crafting systems I've seen in an MMO.
Cons:
-Feels like a single player game. Storyline progression forces you to do some of the instanced quests by yourself. Also, most quests are chains, which forces people to just end up questing solo.
-Dark Anchors, the game's dynamic event content, are boring. Once you've done one, you've done them all.
-Combat. Coming from GW2, the combat in this game is slower and clunkier than other MMOs.
-Load times. They're really bad.
Overall, it's a well-polished game from a content perspective, even if there are some annoying bugs (a lot of people crash loading into Cyrodiil). I like that the dungeons are also challenging. The game definitely harkens back to a day when MMOs didn't hold your hand. Still, it doesn't encourage grouping and playing together as seemlessly as other MMOs do, so people tend to run solo more. That's probably my biggest criticism with it.
Now, here's my character. Check out his helmet. Totes adorbs.