I don't see much of a future for this thread but....
1) Amount of compression isn't the only factor: the type of compression also plays a role. In other words, MPEG2 video can look worse at higher bit rates than MPEG4 at lower rates. What you want to know is "how does it look".
2) Home equipment can be sketchy when it comes to comparisons. In this case, there's obviously something wrong with your uncle's setup if it looks worse than Comcast. In some markets it may not look better, but DirecTV is among the best right now for image quality, trumped only by FIOS. Therefore, at worst, it should look identical or slightly better.
So, the question isn't "who uses the least compression" - it's "who looks the best".