Di Nenno did some awful partner choices that everyone saw were not going to work out, but the moment he got with someone decent (tello, augsburger) he certainly showed what he's made of. He's a completely different player than in his last partnership with paquito, he developed a decent flat smash and a killer backhand volley so I think they will actually perform better.
I would place Martin squarely at the 4th best drive position above Yanguas, Sanz, etc.