But I don't believe that maturity is incompatible with humour. I remember being enthralled with Prince of Persia: The Sands of Time, which had some interesting themes and plenty of fun moments. But the sequel decided to be
darker and edgier and I struggled to find anything I liked about it.
"Dark and edgy" makes me a bit nervous, though: that was in vogue a few years ago and took, say, Oblivion which was charming but for the most part not dark and edgy enough, and gave us Skyrim, which had the darker, grittier side turned up to 11 and which I found a little charmless in comparison.
And I think Inquisition now sets the bar for the minimum number of cheese references a game should have. Which was quite a lot.