The story itself isn't something special but what makes it situationally hard to watch is the degree of romantic tension between the chubby main character and every other female in the story. It's absolutely unnecessary to constantly emphasise sexual attraction between the lead and his female best friend (in a relationship with his best friend) as well as with the elven year old little girl he's friends with, it's just another (creepy) wish-fullfillment for the target group "overweight and socially isolated".
Accel World would have been a decent anime if they focused the energy that was put into fanservice into a bit character and story development. And it would have been good if they additionally had reduced the amount of time spent on solely repeating things the viewer already knows or can easily guess.
In it's storytelling premise and shortcomings it strongly resembles Sword Art Online.
