Nobody ever told me that 'have got' was common. We were advised not to use too many gets in succession (avoid: I got up early but by the time I got downstairs my brother had got all the good cereal. I got my own back when we were getting on the bus because I got him all embarrassed in front of this girl he wants to get off with .....).
The get passive is mainly used in speaking and is useful. It's only used for actions and not states so it resolves the ambiguity in "The window was broken". Are we talking about the fact that the window was in several pieces or about something that happened to the unoffending pane of glass? If we say "The window got broken", it must mean the latter. It seems a perfectly natural extension of the difference between "She was drunk" and "She got drunk."
I think passives with get also imply that without actually performing the action, the subject (if animate) did do something to bring the action about. For example, there is a much stronger implication of misbehaviour in "He got arrested" than in "He was arrested".
Bingley
