First of all, I think the story is outstanding~ Although it may be predictable (like the bad guy always loses), somehow, it is still suspenseful and amazing since the way they win is inspirational!
Secondly, the art is superb~ They made the action seem so epic, and Natsu is so hot.
Sound. Is. Outstanding. In some anime series, when the main character screams it sounds.. funny. But since Fairy Tail is intense, shit just got real... I love how Fairy Tail always stick together, though. That's the most inspiring part of Fairy Tail and whenever I watch it, I realize how much my friends and family are really out there for me. That's why I enjoyed fairy tail fully and why I think this anime is perfect.
