Ok, I have at least a nickel on this topic from first hand experience. To start with, my staff insisted on us going to the MIR, even if we thought it was a small cold. This stemmed from a previous course where they almost had a student die from an infection because he was too stubborn to get it looked at. So, my first trip to MIR was for what I thought was strep throat, they gave me sudeffed for this. I thought it was a bit strange to be getting a nasal decongestant for a problem with my throat (I also was worried about my in-ability to swallow half of my meal). So, after explaining my concern to the Med Tech, she was able to get me some Tylenol. She was almost as baffled at the prescription as I was. Soon after this, many others from my platoon wound up in the MIR with various conditions, and all wound up with sudeffed as well, so much so that we started joking about not going to MIR and just getting our own sudeffed. "Oh, you sprained your ankle, get out the sudeffed." That sort of thing.
My next trip was for my feet. While in Farnham on week 9 we were doing some patrol formation classes, and while running I planted my foot wrong, and feeling a sharp pain down the arch. I kept up with the training for the rest of the week, thinking nothing of it, even completing the BFT. After noticing I could barely walk on the one foot due to the pain I reluctantly went back to the MIR. Luckily I feel this diagnosis was a little more accurate. It turns out that I wound up with pronation in the feet (fallen arches). This was solved by simply doing some foot stretches throughout the day, and by wearing arch support insoles.
Next trip. During week 11 (first week after this past X-mas holiday) the temperature skyrocketed up to +13deg, causing St-Bruno to become more like a river. Between walking on the rough terrain, through stream like condition, pretty much a hell day for walking I did something to my heels. Again, I didn't notice until the weekend, and just dealt with the dis-comfort. Well, with the next week being the final ex of the course my body decides to fail. Well there was no way I was going to say "Oh, I'm sorry PO, my footsies really hurt, can I call my mommy while I'm on my way to the doc?" No, I sucked it up, and did all of the patrols (some reaching 9.6km return trip in length). However, I don't feel this was a bright idea. Yes, I finished the course with my platoon, however I'm still in pain from the injury. I am still seeing doctors about it, and am in physiotherapy. I admit, I did ask the Physiotherapist in St-Jean to limit my restrictions for the weekend because I wanted to be on parade, but I feel like limiting was a mistake. I don't know how long it will take to heal properly, however I feel if I addressed the issue sooner I may be in a better shape.
I guess what I'm saying is that the system is a double edged blade, and depending on what's wrong, and who you see to deal with the problem will determine how well of an outcome you have. Having seen it from both sides, I feel there could be some fixing up to be done, however, with the amount of staff they have vs. how many MIRC's they have come through, I'd say they are doing a good job there. My only fear is that others will mark me as a MIRC due to a legitimate injury.