Very important, please read.
A lot of writers on the internet are young. Some as young as nine, and some as young as sixteen. Certain writers can take negative feedback and discard them like they should. Others, especially the younger ones, only lose their love for writers.
I request all of you to stop being so negative or blunt when it comes to leaving feedback. Not everyone writes professionally, especially in the world of fanfiction. "This wasn't enjoyable" or "This was so typical" is rude and absolutely unnecessary. If you aren't going to leave helpful feedback, then leave without telling them that they're writing and creativity sucks. Find another fanfiction which you can enjoy.
When I first started writing, I had someone, who was a higher status than me at that time, leave me critiques. They ruined my motivation and ruined my self image as a writer. I wanted to quit writing. Then, I thought about it. I realized that all of those critiques they gave me could've been constructive criticism. I advised them on this. They were understanding and have been positive towards my mistakes ever since.
No one is perfect, and no one will have perfect English (or any other language). Don't judge people. Don't leave sarcastic comments. This doesn't go for just Wattpad, this goes for all sites where you can enjoy authors' works. Don't be the person that ended up ruining a little kid's dreams.