You guys are absolutely right. Skid steers are horrible machines. They can't do anything right. That must be why they are so incredibly popular with professionals....
You've missed the point entirely why skid steers are used by pros. It's not that they are the best tool for the job, it's because they are the easiest to get there, and they do a variety of things adequately. In construction, portability is very important. Having a machine that you can haul around with a pickup truck is going to be the deciding factor 90 percent of the time.
If you are not moving it to a different job site every day, there are a lot better machines for clearing land and moving dirt.
And while you may consider four wheel drive on a skid steer to be able to drive it in mud, it's lack of a suspension, and it's tire design makes it just about worthless in wet conditions. It's weight acts as a negative where in all other types of tractors, the weight is a bonus. Since it does not have steering tires, the treads are always smooth, leaving it without any traction.
You will also find that anybody making a living required on the use of a skid steer either owns other machines, or rents them. In my experience, there are very few skid steers on any jobs I've been on. Excavators have taken over, especially mini ex's. Still plenty of dozers, backhoes, loaders and graders. The only place I've seen skid steers on jobs are with landscape contractors planting flowers and moving pallets of grass.
If you get one with skids, it will perform a hundred times better off road. The question is at what cost and how long will the tracks last?
I am a contractor and have a fair amount of time on skid steers. I also have quite a few hours on other machines. I don't know where you are getting your information about the pros, but look forward to you proving us wrong.