Since I use anime-planet to keep track of my anime life, I guessed that I should say why I like it.
1) I am able to keep track of every anime I want to see- I like how the site has just about every anime under the sun and I also like how easy it is to find a series that you are looking for. I also like how the entries also contain alternative names to each series, which makes searching for the series much easier. I also like how I can categorize the anime in my want to watch list by genre and format.
2) Reviews have never been this easy- I like how simple to reviewing process is. All that needs to be done is to watch and write about it. I can also give each category a different score depending on what the anime accomplished for me.
3) I have yet to run into anybody who leaves rude comments or trolls- I receive comments every now and then, and none of them are rude or troll my account. I like how this aspect is way different than any other site. The worst I've ever gotten comment wise on this site is that I was told that I was "Hard to please" with anime, which isn't bad at all.