My readinglists: 
Wolfish enjoyment and Bloody amazing and Fangirl magnet contain average or (very) good stories, one for werewolves, one for vampires, the third for a romance.
Add to venture are adventure stories or tales about trips and journeys, often combined with romance. 
MySTORYously are mysterious books, often with a hint of the supernatural and a big adventure. 
Aw(kw)ard worthy: Humorous books that make you laugh awkwardly while you are in public and just guffaw at your phone. 
Gimme more (history) are great books, sometimes with a hint of fantasy, the focus lies on historical stories, or stories that are set in future worlds (/worlds from legends)
Supernatural pulse riser are fantastic supernatural books. 

Incredible can't put aways are incredible, brilliant, excellent books, the genre doesn't matter. Those books are awesome!

Breathtakers are my ABSOLUTE favourite books on wattpad. In my opinion, the book has to be simply amazing, beyond words, has to make it, well, hard for you to breathe...

And I just want to add that I was 12 or 13 when I first got wattpad... So some oft the books I have read here are a lot better/worse than others