I had the same experience as you did over many times testing sling. What drove me away from it each time was a big broadcast episode that dropped out or became so pixelated that it was not watchable. Flipping over to Vue on the same program and it was rock solid.My experience was more pixelation randomly throughout the process. I also had issues that a football game video would just freeze while the voices would continue going. I also hated the interface on Sling. The DVR function did not work very well compared to Vue. It would record random shows from a year ago where as Vue would only record new items. The guide is ridiculous and I also had a long pause when changing channels
None of the issues should be my internet btw as it is more then fast enough and I live alone.
While I found several things to like about sling, if it keeps me from watching the very few things I do watch, then it isnt worth it.