I have only had my 922 for a week now, but I absolutely love it. Obviously not having it for a long time, I haven't had as much time to experience some of the problems others have, but I believe that a lot of the previous issues have been worked out with software updates. Either that or I just happen to get a great 922 so far
More to your question, which wasn't silly at all, I actually got the 922 for the Sling capability, but I have found that I am rarely using the Sling and am instead extraordinarily pleased with everything else about the receiver. Its hard to put into words why I like it better than my 722, its just such a more pleasurable experience. Everything is much easier to find and much more user friendly.
One specific function that I find a vast improvement is the DVR management. The pictures actually help more than you would think, but aside from that moving items to and fro the EHD is much easier and adding folders and sorting is a breeze.
I liken it to whenever someone asks me why my smartphone is better than their dumbphone and everything I say (i.e. email, web, app, nav, ect.) they claim they can do the same on their dumbphones. Technically they are correct, but its just a whole different more enjoyable experience.
Typing this has made me think of a different related question though. What is the return policy, if any, on Dish receivers? Could the OP chose to get the 922 from Dish and then return it if he felt it wasn't worth it to him?