I dont think Hull is going to turn it around, and to be quite honest, Sunderland is always in the relegation mix, hell, they'd be down this season if not for the stars aligning on the very last match day.
Watching that Community Shield match I found neither Chelsea nor Man U all that impressive. The only thing I feel Man U has over Liverpool is depth, it will be interesting to see if Liverpool can handle all the competitions this season, because first team to first team, I think they'd tear Man U apart much like they did last season.
Apparently now that C. Ronaldo is gone, Man U doesnt have anyone that can score a penalty kick which is where half of Man U's goals came from last season, a Ronaldo dive in the box then convert the penalty.