Oh, I wasn't aware that Civ 5's score was
that high. I do know that it took a long time (a couple of years) before Civ 6 surpassed Civ 5 inn number of concurrent players. Still to this day, with regular content being released for Civ 6, Civ 5 still has about half the number of concurrent players. Not bad for a more than 10 year old game which hasn't seen any new official content in over 7 years.
Actually, looking at the number of concurrent players over time for the two games is quite interesting. Unfortunately, there isn't any data for the first 2 years after the release of Civ 5, but we can see that Civ 5 reached a peak with the release of Brave New World, and after that, it held a constant high number of concurrent players which didn't start to slowly drop off until 3 and a half years later, when Civ 6 was released. Civ 6, on the other hand, started out with a massive peak on release (I do remember the build up and excitement, no doubt helped by the success of Civ 5). It then immediately dropped below Civ 5's level, and stayed there until a new peak was reached with the release of the first expansion. Again, numbers dropped below Civ 5's level shortly after. Civ 5's popularity was slowly declining throughout all of this time, which is natural for such an old game which was no longer receiving content, and at some point not long before the release of the second expansion for Civ 6, Civ 6 did surpass 5 in terms of concurrent players, albeit not by a lot. The second expansion gave it another boost, but levels didn't reach anywhere near what Civ 5 did after
its second expansion. In fact, it is only now that the game is getting regular content updates that Civ 6 has even come close to the level Civ 5 maintained for 3 and a half years with no new content, and is managing to hold more than 50k concurrent players consistently.
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I think this speaks volumes to the lasting appeal and quality of Civ 5. I believe Civ 6 has received a higher quantity of content than Civ 5, but in terms of keeping players engaged, the more refined and interconnected systems of 5 seems to win out. At least that's my take.