That bigs list is more of a list of bigs most exploited one on one. And as mentioned, just man to man, no help defense.
Personally, I think David Lee is the worst defensive big, especially man to man. But he's not last on the list. Well, he missed some time, but also there's a good chance teams like to exploit the Curry/Monta backcourt a lot too since that's just as bad defensively. So as bad as David Lee is, because he's playing with other defenders just as bad, it will be spread out more equally.
In Love's case, Beasley is worse and is probably exploited more. There's a chance they also double Love's man a lot (Rodeo would have to confirm/deny this, I don't know) which limits opportunities.
Anyway, there's no one on that list that shouldn't be on it somewhere, so I think it confirms what we think.