The only thing about Finn that I enjoyed and thought was smart to do was he gave a human element to stormtroopers. That's it. In all the movies the stormtroopers are faceless, drone like servants who become major collateral damage.
It was nice to see a perspective from the Stormtrooper.
Ya know Billy Dee is supposedly going to be in future films...please, please, PLEASE don't make Finn his lost son. Keep the family mystery to Ray.
Also there are strong rumors that Hayden Christianson will be making an appearance in future films. Probably for flashbacks but...not sure how I feel about that.
I still think Rey a Skywalker, from Luke but I like the Annikan reincarnation theory especially if Plaugeus is a certain CGI character.
I wouldn't say these are 'spoilers' since we're just guessing.
I think he's the new "Hans"... run from a fight but when up against it, man up. A good man at heart. Sort of their version of Doctor Who.