LOMS, you want to give me a quick pep talk as to why I should play?
If you were within the age range of the original Gameboy games coming out, or when the trading cards took over schools, it's a really fun callback towards something that you'd be surprised how much you remember.
If not, I know some people who still play it who were never into Pokemon but I'm sure it'd be tougher to get into. It's basically like any other good phone game, it gives incentives and rewards to keep gaining experience and leveling up, but it also uses some cool little augmented reality bits, and encourages exercise and social interaction. Any rare-ish pokemon aren't going to be found wherever you're plopped down, you'll have to go search, as well as walk to hatch Pokemon eggs, and often at parks and public places you get a lot of people from all ages getting together and showing others where they found certain things.
Important note though, I don't know how enjoyable it is in smaller/more rural areas. Playing in Chicago is a luxury because there's people and stops everywhere.