Pre-season is merely a testing ground, particularly for a new manager, seeing what he has to work with, which lets face it based on last season wasn't a great deal. Even my lowly Saints managed 2 draws agains the "mighty Reds".
As I write this comment I'm watching some live scores going on, and see that Melbourne Victory are 1-0 up against Utd after 20 minutes (granted it's still early in the game), but touting a win against Liverpool in a friendly as a success doesn't hold much sway when you throw away any perceived progress in the next game.
I would pass on this!