KCP, KCP, KCP (that’s how bad he was), McGee and Lance were the worst offenders. Kuzma always hustles to contest three point shooters and try to draw charges (usually too late) regardless of the consequences.
Rondo simply doesn’t defend. LeBron was terrible all year.
Even Hart, as much as I love him, was terrible in on-ball situations against quick guards, but a hard, unglamorous worker against bigger players.
Chandler was a solid team defender, but too old and beat up to do it for 30 minutes a game the entire season.
Only Lonzo was able to play good defense, and even then, he had some weaknesses in getting beat to the rim (although in many cases, he was playing to the team scheme and the big didn’t make the proper rotation).