Galliano doing the men's line for Dior would just frighten me. I think its relative merit would have to do more with whether or not John has had his pills that day than anything else.
He's great for a women's collection, where there can be more whimsy in terms of design, cut, texture, etc. But, for men, I just don't think there is that much room for outlandishness. Menswear design needs someone who actually feels comfortable being from planet Earth. I think Galliano has struggled with this his entire life (haha).
The menswear designers I respect most are the ones who can ride that thin line between making something interesting and making something a man could actually wear down the street without feeling like a clown. Helmut lang was one, Jil sander was another... but they're both gone now.
Galliano has lots of interesting pieces in his eponymous collection for men, but not something I could ever see most people wearing. The quilted blazer, for example, was conceptually very interesting but I just don't see how I could pull it off. Hedi rode the line between interesting and wearable pretty well... that is, if you had 27 inch hips and a 30 inch chest.
John