Hi Caius,
I went through the SB database of reported games played and came up with the following table (see image below) that shows the number of games played per SB title. The totals are definitely skewed by when the games were released, but it should put you at ease knowing that AotR has the second-most number of games reported - and by a pretty good margin too.
The last two columns of the table can be used as a rough metric of how evenly balanced each title is. Note that the "SIDE 1 win %" column ignores draws. Also keep in mind these percentages have not been normalized to account for the scenarios that Ozgur tends to play the most. ;)
And remind me not to start any "The Proud and the Few" scenarios. Yikes.
Bill