I did play pokemon GO once while I was working holiday at London.
I am not too focus on the pokemons, but I found something really interesting while I was playing it.
First, it force you to walk, you have to walk to certain places to catch the pokemon or meet the pokemon.
Second, it bring you to the places you do not or you might never visit before, it helps me visit many local places at London.
I believe there are many upside of the game, but the only downside is that you have to stare at your phone the whole which is also a bad thing.
Use pokemon go as a map, not a game.