Okay, here's my reasoning behind my opinion:
Using The Force takes the utmost dedication and training. It is not something accomplished lightly.
Consider that Luke Skywalker was a person who had incredible potential with the Force...yet he grew up without even knowing it. Without the training of Obi-Wan and his own subsequent devotion to learning, it's likely he could have gone his entire life without even knowing The Force. Sure there might be minor effects, but nothing that couldn't be chalked up to 'luck' or latent skill. (Like Anakin pod racing, or having some strange dreams that sometimes come true).
Now on the other side of the coin you have a Mandalorian. I think people forget about what it would take to actually be a Mandalorian. They think...born into or adopted into a Mando family....*check*....get some mando armour...*check*....get a mando attitude to life and family....*check*...woo-hoo! I'm a mandalorian!!
If this were the case, mandalorians would get wiped out as the bas-shebs'e of the galaxy. In order to build and maintain their reputations, they need to be able to back up their reputations. This takes training, especially if you consider the number of warrior cultures and societies onour own planet and then imagine that on a galactic scale.
Consider the promises made by their reputation: they have to be THE best warrior/soldiers in the entire galaxy...not just a few individuals, but EVERY ONE of them has to be among the best. Think about the training and sacrifice made by Earth's Navy SEALS and Special Air Service and JTF2 Operatives...we aren't talking about the best of those organizations...but that every single one of them has a minimum level of training and ability just to be among those units.
Then multiply that skill and ability by several factors because you are competing with the warrior societies of thousands of worlds. It amounts to a dedicated lifetime of training and experience in fighting; That doesn't leave a lot of room for learning about and mastering something esoteric like 'The Force', especially if there isn't a core of support within the organization.
The Jedi have a long tradition of using The Force. They are the guardians of learning and using The Force...it's what they do. They recruit from infancy and those recruits do very little with the rest of their lives except learn to fight with a laser sword, maybe fly a space ship...and use The Force. Many never complete the training to become Jedi, and even the ones that do aren't even all that great at using The Force.
A Mandalorian who has the ability to use The Force is likely going to go 'undiagnosed'. And even if it is discovered, there is not likely to be anyone capable of training that person to do anything reliable or practical with The Force, since it's not typically within the Mandalorian community's precis.
So, I'll concede that under the rarist, most contrived situations, it could happen...but it would be as common as a tattooine moisture farmer opening a jedi academy.
Even then, that rare Mando Force user might be capable of a few 'parlour tricks' at best. Nothing that his skill and training could accomplish more quickly and efficiently in most situations.