[bermanoid]

Game workloads don't require ad hoc queries, typically - you're usually just stuffing a save state into the database every few seconds, and you route everything that you might need to query through analytics (except maybe billing, which you'd probably handle another way). Zynga pushes analytics data into their biggish (a few hundred nodes IIRC) Vertica cluster, which is far better for that sort of thing than most random access databases.

In any case most game state data wouldn't be very useful on its own, you typically want to look at event streams and histories of certain values, not snapshots of the current state.