I like David Luiz a lot actually, most of all his spirit and drive when he plays. Those nutmegs yesterday were really clever by Luis Suarez, and fans who make fun of David ironically also take away some of the cred that Suarez deserves for pulling of what he did. This could have happened to many other defenders other than just David Luiz.
He played while injured as well, which certainly doesn't help, and the effort he showed while running around out there in pain deserves respect and just shows that fighting spirit that I like so much.
His performance against Chelsea when he wasn't injured and was firing on all cylinders was great, and shows that he's a really great player.