I just made the switch from DishNetwork to DirecTV this past weekend and must say the difference was completely understated on all of these satellite boards.
The picture quality, sharpness, and colors are SOOOO much better on DirecTV compared to DishNetwork, its like comparing ripe tropical fruit to sour vineger rancid grapes.
Seriously, overall the quality is 25% better I would say. The higher resolution is the most noticeable feature. My 34" 16:9 directview really shows the difference. I made the switch partly motivated due to a 2-tivo/3lnb deal for $169!! Pretty amazing. Dish network's PVR508/301 setup really can't compare. They are in different leagues.
I find it unbelievable now that so many people have much anything good to say about dishnetwork. Overpriced limited equipment, and overcompressed signal really kill Dish if you see the two side by side.