I played it on the PS3 and liked it, it took me about 3 hours to finish. It's hard to compare it against other games when it comes to value, because it competes on artistic value rather than just hour of entertainment per dollar. Hour per dollar is a tough metric anyway, since MMO players who play 20 hours per week pay about 18 cents per hour for their gaming dollar. Obviously that doesn't mean Limbo should have been priced at 50 cents.
I'd rather compare it to something else I can do with $10, such as see a movie. Playing Limbo was better use of $10 than many of the movies I have been to this year.