Opinions may vary, but IMO, Dougie is what we hope Hanifin would become. That said, Dougie+deHann more than offsets the loss of Hanifin (age/contracts not withstanding).
de Hann is a good partner for Faulk who looks much better this year with that stability. Dougie and Slavin have meshed well which allows Pesce to be on the 3rd pairing (even though he's playing the 3rd most minutes OA). It gives 3 solid defensive guys (Slavin, de Hann, Pesce). They still play aggressively though, which can lead to some odd man rushes/break-aways. That's more of a system thing.