Hey there!
The reason why I like MLP is because it is a funny, light-hearted show that is suitable for all ages.
It talks about the importance of your friends and how despite having flaws themselves they can help you out in the worst of times.
All the characters are entertaining to watch and listen to, the animation is quite good and the adventures they have are pretty awesome.
I also really like the fandom behind the show as well. There are a ton of creative people writing fanfiction, making music, and drawing pony art. It really is an awesome experience to be able to talk to these incredible people. The show displays good morals and encourages you to be the best you could be and is really positive with it's messages. It also has really dynamic characters as well and I love how the show can center on different ponies in each episode it keeps it fresh and exciting. The ponies in MLP have depth to their character and aren't 1-dimensional with their personalities which is another factor that I like. Overall to me, it is a show that is definitely worth your time.