You're comparing a $700-$2800 line of cameras to a $20k camera...
The reason the DSLRs look cheap is because most people who use them open the lenses all the way, and sporadically focus on random objects, and often don't even have the skill to get those objects in focus. The reason why so many DSLR videos look like garbage is because people get so caught up in shallow DOF that they approach the art of cinematography impulsively by opening the lenses all the way rather than correctly lighting a scene. I'm all for tools making jobs easier, but it's a double-edged sword. While some people will use these tools correctly, most people will use them as a crutch for their shitty artwork. DOF does not constitute a "cinematic" look. No self-respecting cinematographer would have only half of his subject's eyelid in focus...
RED cameras are essentially 4k image sensors with a laptop built into them. They don't have moiré, aliasing, or line skipping problems, so from a technological standpoint I don't see how you can even compare the two. Having said that, RED cameras aren't perfect either. Hollywood films shot on RED stick out like a sore thumb compared to their 35mm counterparts; to some this is a good thing, to others it is a bad thing.
Ultimately, the cinematographer dictates the quality or "look." Technical specs are only as good as the glass in front of it, which is only as good as the person using them, so this argument really doesn't make sense. I've seen tones of DSLR videos that were amazing, and RED footage that was absolute garbage, and vice versa.