Fairy Tail is not even close to being my favorite animes. It has constant repetition, lack of character development, and overall bland arcs for the most part. Yet you'd think it would rank lower than lots of my shows. But why does it stand at a 6/10? The answer. It's bad enough to where it's good
The characters are likeable, the interactions with every character is likeable. There is a sense of family when you are watching Fairy Tail that makes you so intrigued to watch. You aren't watching the complex and well written characters fight, you are watching some fun actions thats turn off the brain fun, not some amazing thriller which requires tons of knowledge.
Yes, Fairy Tail is not great. But it does a good job of being bad