Yeah, our defense against threes stinks right now; we're 26th in the league in terms of 3PT% allowed. Teams are hitting 37.7% of their threes against us, which is wretched. It's also hurting our eFG% allowed, which ranks 22nd. For a team built around it's defense, that's unacceptable.
We're shooting 34.9% from 3PT, which is middle of the pack. However, we rank 27th in total threes made.
So yeah, the "can't defend it, can't shoot it" description is probably fair.