Mcdermott's defense is better than most people think. He is light on his feet and has high iq to make up for lack of elite quickness/athleticism. He will also usually have a hand up, and if you get score over his 6'8 frame, 6'9 wingspan it will take some effort
On offense what i like best about his game is tha the will come around screens with his hands out. He wants the ball and most of the time he gets it, its in the basket. He is very confident in his ability to score
Like have already said, even though he will have a harder time to get free and score in the nba, he will still run around like a headless chicken and try. It doesn't matter how good of a defender you are, you will eventually tire out trying to cover a guy like Mcdermott