It depends.
If you use tight marking against a player with 20 off the ball and a lot of acceleration and pace, maybe your defender will be caught behind.
But if your defender has 20 on anticipation and positioning and marking, he will prevent that fast player from getting the ball.
I use tight marking of the FB, so my wingers got with them and dont leave my Fb in 2-1 situations. This is just an example, ofc.
It is useful in a wide array of things and its awful in others.
IMO, study your team and better than all, test it!