Could be smart thinking on Diddy's part. It wouldn't look right to give the kid a station wagon. But other than that, I don't see this as the kind of car that a 17-18 year old would dream of driving. It's not even a car that someone my age would dream of driving (if they're truly a "car guy"). It's an "old man's car", IMO. But if Junior doesn't like it, I guess the reply could be, "if you don't like it, when you make your own money, you can buy what you want." I doubt that car will get 5K miles on it over the next 2-3 years. For all I know, the car is on lease or is a gift/PR opportunity from Daimler-Benz.
And if the kid is on a path to be more like Ivanka Trump and less like Paris Hilton, maybe Combs will take him under his wing (if he hasn't already). It sounds like his improving grades were the reason for the gift. People buy their kids odd gifts these days. To be honest, I'm more disturbed hearing about (average) 1st graders carrying cell phones in school than I am anything about Diddy's kid.
Like I said, I've never cared for Puff Daddy/P. Diddy/Sean Combs. I've always thought of him as an obnoxious punk. But I can't deny, he does have a good sense of how to market himself and his brands. And so, he makes a lot of money.