Personally, and I'll admit that this is from a limited experience living on base, but I feel that the MPs have developed a degree of resentment among other trades. I say this based on conservations with other CF members, several of them reservists on work up right now. Now you could say that this is just young troops not accustomed to living on base, but I feel the points are valid regardless.
The sight of several MP cars patrolling an area which is essentially free of random crime, such as (to my knowledge) CFB Edmonton, and pulling over troops at night for driving 5 K over the speed limit is not something that inspires respect. Several of my good friends are, or wish to be, police officers in the future, and understand this as a requirement. However, when it is the sum visible role of the MP domestic role, it seems as though the trade is filled with, and excuse me if this is offensive, the caste offs of more "legitimate" police agencies who have decided to spend their lives enforcing petty restrictions or busting drunk troops in shacks. Now, argue this as you may, I'm open to the opinions of MPs, and I don't doubt the requirements of busting drunks around base. That being said, their are other roles relating to the security of bases, such as CFB Edmonton, that are deplorable.
CFB Edmonton has deployed at minimum one company for every deployment in Kandahar to date. Yet there is no force protection in place for the base itself. The sole defenses the base has is either a) the off chance that an MP picks up a suspicious person, unlikely since their are many civilian employees who work on base; or b) an attacker comes through the front gate during non business hours, unlikely since that's when the most targets will be gathered. Now, the solution to this, in my mind, would be to beef up the domestic force protection role of the MPs, in both manning the gate, ideally in FFO with C7s, and patrolling the base proper to guard against threats to the base. Just think about it, we've had a serious threat of a devastating terrorist attack in Canada, the "Toronto 17," and if a terrorist element truly wanted to hurt the mission in Afghanistan, all that would be required would be a quick internet search, a drive to a mounting base, and a suicide vest. The role of the MPs should be guard against attacks such as this in the domestic theater of operations.