If I remember correctly, the mid-sizers are still a coupla inches smaller in most dimensions and the curb weights are 0-300lbs lighter. Of course, this all depends on body styles, trim, powertrain, etc.
To quote the author: "The Ranger’s interior is certainly nicer than the Colorado’s" - that's the first time I have ever read that in any review comparing the two vehicles. He then goes on to trash the layout and utility of the Ranger interior, which I have indeed read in every review of this vehicle. By the end, he also declares it not competitive price-wise either. What a strange review.