Steam has so many users I'm not sure the average says a lot? If you are just playing Hentai games like most Steam users (j/k, probably) you can do that on any device from the last 10 years.

More interesting would be to see the specs for users who bought COD (add other popular franchises as you wish) in the last 2 years. That would at least trim the sample set to those who expect to play recent graphics heavy titles.