I also like the game's tagging system. In most MMOs, the first person to attack an enemy gets all the experience, loot, etc from killing it, while anyone else outside the group who fights it gets nothing. In ESO, anyone who gets a hit on the enemy gets experience, loot, and any quest progress or achievement associated with it, even if you're not in a group with the other person. This leads to situations where random people can meet in a dungeon and, without speaking, can simply team up and start killing enemies together without any sacrifice of loot or anything else, all without grouping. I've had a situation where I came upon a boss monster in a dungeon I couldn't beat. I waited until a few other people gathered around it, then we all attacked, beat it, got the loot, and earned the achievement. It's a good system.

I should also mention that many of the negative opinions I've read about the game seem to come from people who want to play the game very quickly and reach the highest levels in a hurry, and they become frustrated by the Veteran content. The Veteran content is the ability to play all 50 levels of content for each of the other two factions (there are three in total) once you've finished your own faction, gaining ten extra veteran levels for higher level gear and more skill points. Because the ten veteran levels comprise 100 normal levels of content, it takes a long time to beat. There are people who get bored because they're trying to plow/grind their way through it, skipping dialogue and just doing the main quests, leaving them underpowered and unable to reach the top veteran level in a hurry. Personally I'm greatly looking forward to an extra 100 levels of slow questing and exploration in different areas of Tamriel once I finish the areas of my starting faction.

Finally, their first content patch is coming reasonably soon. It's an entire zone designed for four-man groups, with all the quests balanced for four, including four-man dungeons, and with a 12-man raid at the end. I'm not a big group player, but I'm glad there will be content for people who like to play that way. By the time I get there, maybe they'll have more solo content for me.