Most people don't go on car forums. I just had to take my RAM in for service and won't you know it, about 4 Compasses on the lifts with about 6 more out in the parking lot waiting for service. Roads in Michigan aren't the greatest but they were in for busted sway bars and lack of oil in the crank cases (think the service advisor said all 2018's) just like I kept bringing mine in. Only one was in for something not related to sway bars and burning oil, it was to replace the auto start stop AUX battery and replace the radio.
Still, people are far far more likely to register to a car forum to complain than praise. This is not just cars, people are far more likely to complain about problems they encounter, because they discover forums while googling their problem. If you dont have any problems, you dont google and never find or need the forum. So for every car with an issue here, there are probably 100X, if not more, cars without the issue.
I mean the service we have hear dont have any pile of Compasses on its parking lot. And I live in a semi rural area which has a single FCA dealer in ~2 hour highway driving radius, so it is a relatively big one service with no alternatives. I drive next to it everyday, so I can see which cars are in for the service that day. I didn't see any unusual number of cars of any model, let that be Compass, Grand Cherokee, RAM, Renegade, etc.
That much of cars in line at your FCA service just makes me think that it is a incompetent service center that can fix stuff, so there is a line of cars to be fixed, refixed and refixed. I have been using my service department sine 2006 (after I got a 2006 grand cherokee) and to be honest I never had to take that car, or the compass, for the same issue twice. They have always been able to fix it in one go. There has been cases where they had to hold the car for some period of time and try various fixes if the first one didn't work, but they never gave back the car without making sure it was fixed. So, when I got the car, it was always fixed and I never basically had to "test drive" if their fix worked or not. I think a good service center is key to having a reliable car.