As the title states, Diego Costa is good at one thing and one thing only: putting the ball in the back of the net. As someone who is normally pretty wasteful in front of goal, finding a striker that can do this with consistency is priceless and Diego Costa fits that requirement perfectly. If you're like me and you grind out 1-0 or 2-1 wins, Costa is the perfect striker to make the most of the handful of chances you have in front of goal. Overall, if you have good players that can work chances for the striker he will finish those chances regularly.
He won't run away from defenders, nor should he with 75 pace. That being said, he doesn't need to, as his game is doesn't involve running at defenders, but getting into good positions and finishing off moves.
By far his most important stat, Diego Costa's shooting is amazing. He excels at shooting inside the box, whether it's on the turn or one touch. His long shots are decent, but I wouldn't try anything too crazy. His finesse shots are also ok, but don't expect to score too many insane curlers from outside the box, because its not his game. Lastly, his 4* weak foot is great, and allows him to score freely with both feet.
His passing is meh. Try anything longer than about 15 yards and it will most likely result in frustration. That being said, if you keep your passing short, and use your midfielders to play longer passes, Costa's passing won't be a problem.
Costa can keep the ball at his feet, no more, no less. He's quick enough with the ball at his feet, and his 2* skills don't seem to be a problem for a player in the role that Costa plays.
Strong enough to push defenders off the ball and win it back occasionally, but doesn't really matter in the grand scheme of things.
Absolute beast. Holds off defenders with ease, and combined with his decent dribbling and good shooting it makes him a menace in the box.
Shooting - absolute class in front of goal
Strength - can hold off most defenders, hold up the ball on long balls up top
Heading - very good in the air
Corners - great at scoring bicycle kicks at the front post
Pace (kind of) - he isn't fast, but pace doesn't seem to matter as much in this Fifa,
Dribbling - combined with the skills, I would avoid trying to dribble through defenses with Costa, it just isn't his strength.