This is for the challenge hosted by @VinMcCarthy so be sure to check him out so you can participate!
I'm going to have to go with Log Horizon for this one! I absolutely love these types of anime. IMO this is by far the best in game anime! Yes, I think its better than SAO and .hack although I enjoy watching both of them as well. I love everything about this anime, from the story line to the raid battles that require teamwork and not just one person sweeping through the enemy to the down right hilarious comedy and thrillers in each episode! Whats Yours???