1.) It's fun
This is especially true if you're familiar with the show and games. Seeing something you've been familiar with for so long pretty much come to life is incredible!
2.) It's exercise
I'm not going to lie to you. I've walked more since this game came out than I have since I was a child. I'm constantly hatching eggs and now that the game has a new buddy feature, I'm going to be constantly evolving things, too.
3.) It's competitive
My roommate and I are constantly getting new pokemon to crush each other with, not to mention the gyms and different teams.
4.) It's a conversation starter
I've honestly met a lot of people through this game. Some of these people are those who I might not have even considered speaking to without seeing them take over a weak gym.
5.) It's easy
Honestly, we all know this one. This game is one of the simplest to learn and play. I taught my grandmother how to do it.