Nicely put.

The thing which strikes me so much about John Salthouse's portrayal of Galloway, maybe even more than Burnside, is just how textured his performance is. Salthouse really does sell Galloway as a real person, warts and all. He's outwardly a bit unpleasant at times, but inwardly he genuinely cares about others. Its a very layered characterisation.
The thing with Galloway in comparison with Burnside is that Roy
does have the trust of his team. He might have quite violent disagreements with many of them from time to time, but he's not backwards in coming forwards to praise those who work under him, when he feels that praise is justified. Compare this to Burnside, who even as late as 1993 was still considered to be a bit of a "lone ranger", who never truely had the respect of those who worked with him. A recurring thread with Burnside was his lightning quick ability to sell a member of his team up the river if it meant personal glory for himself -- Galloway would never have done anything like that.
Galloway's relationship with WPC Ackland is interesting too -- in IT'S NOT SUCH A BAD JOB AFTER ALL the two of them are at loggerheads, with Ackers nearly quitting the job because Galloway's such a bastard to her. But WITH FRIENDS LIKE THESE sees them working closely together on the rape case, and they even go outside and share a smoke and some sympathy at one point. By the time of season two's finale, THE CHIEF SUPER'S PARTY, there's a definite implication that they're attracted to one another, but they keep it at bay for professional reasons. Marquess would probably have developed this more blatantly, but I kind of like the way the early episodes touched on the idea without making it explicit, leaving the viewers to draw their own conclusions about the characters.