Look, I couldn't put it better than our own Harry Slater did in its review. Motorsport Manager is "A cunning and addictive sim [that] offers enough that genre fans will love it, and casual players won't be put off".
It may have gone on sale before but it never got as cheap as it is now. You see, as of today, you can get it for the fine price of $0. In pounds that's £0.
You'll have to get your team together and manage how they race in order to get as much money as possible from all these races. It's fun and addicting and you shouldn't miss it.