An indicator for how broad the serious gamer base is can be found in the stats page on steam achievements (for Rome 2 in particular); in particular the part that deals with number of campaigns completed; and the number of campaigns completed on the hardest difficulty settings. To cut to the chase, the stats are not encouraging. Most Rome 2 owners have not completed a single campaign (note, that, in Rome 2, you can get the achievement by completing just the short campaign requirements). The number of people who have completed a legendary campaign is less than 1% (I believe, it was significantly less than 1% but have not checked that page in more than a year).
Also, there used to be a stat for the number of people who complete more than 100 turns (or something like it). The stat for this was less than 50% when I last looked.
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