Funny you should mention that. I've been slowly exploring the idea of moving away from my OpenSeed api to the blockchain. One of its main features was a "universal leader board" which could be tied into all sorts of gaming interfaces. I started calling the idea "decentralized Steam" and I'm hoping to have something to present later this year (assuming I can work out all the needed features)

All that to say, yeah I think using the block chain is a swell idea for gaming.