A few pointers
1) Airport doesn't control number of immigration staff
2) If you hadn't been so long in passport control it wouldn't have been an issue
3) 50 minutes to get bags to carousel. Who employs the handling staff is it the airport or is there a handling agent at Bournemouth? If it's the handling agent then the airport can only express it's dissapointment in the service provided.
4) Car park barrier broken. Once again is this facility operated by airport or third party? If third party is running the car park then same as above the airport can't really do anything about it.
5) Nobody helpful everybody rude. - Manners doesn't cost anything but sometimes somones mood could be a result of how yourself and other passengers have reacted towards the staff. On lot of these occasions the frontline staff bare the brunt of abuse for reasons that is not in their control.
My advice is to write your view and experience to Bournemouth Airport as a passenger and maybe advise them of ways you think it could be improved.
It looks like you have experienced unfortunate combinations in lack of staffing at various departments and technical issues with the parking barriers. The staffing issue could be a result in the lack of other aircraft movement and therefore not necessary to have a full compliment of staff as it is deeemed non-profitable.
We are still in the recession when it comes to airline travel and the airline industry and all companies are in the need to save as much money as they can to stay in business.