If your average 13 year old, has a choice of downloading a game for free (assuming they are already subscribed to gamepass) & buying a different console and paying for a different game, a lot of them are at least going to try FM7.
I think I've had a very different experience with this game than you - I have no experience of gran turismo at all, so can't comment on the quality of that game. I have had and continue to have a lot of fun on this game, it works consistently for me, looks great - I don't get all the negativity. Each to their own I guess.