Paul Farquhar
Legend
They mean "critically acclaimed", "game of the year contender", "cost serious money to make", that sort of thing.that would be even more meaningless, and an odd choice of words. I do assume it does mean something along the lines of ‘mature’ / ‘not light hearted’ rather than your ‘lots of sales’ interpretation
It's easy and cheep to make a game devoid of jokes, it's hardly something to aspire to or boast about.