As for the rest:
I very much dislike Tiafoe's forehand and serve. Just hurts my wrists to look at.
Khachanov's forehand take-back looks like it should result in shoveling the ball into the bottom of the net.
Berretini's game is a little clumsy looking.
Zverev's serve is one of the ugliest of the last 30 years, he has the body of a human crane fly, his forehand's a bit loopy and there's some quirk about the backhand take-back that bothers me.
I already admire and loathe Opelka in equal measure, as I do Isner, though his ball toss is a bit wilder than Isner's atm.
Shapovalov I want to like but just pisses me off because he continues to appear a bit dim on court.
I should give a shout out to Rublev who I have a soft spot for, in spite of the obnoxious grunt, since he has almost exactly the same figure and build as I have!