They may be setting Finn up to be a larger presence, but I kept feeling like he was the simple storm trooper that happen to have a conscience and is now naive to everything. Kind of like the kid in a candy store.
That may be exactly what Abrams wanted me to think... And then, WHAM!, he's the next Jedi master.
Sounds like I need to see the movie again to sort it all out.
j
I heard someone make the interesting suggestion that Finn could turn out to be a Spartacus like character, helping to turn other Stormtroopers against the First Order.