ok mate
Moyes definitely is, Guardiola is limited in his approach. He's had sides with megastars in to win almost by default. Give him a side outside the very top and see what happens.
Take tonight as an example - he's needlessly hamstrung Lahm as he's obsessed with a possession game in the middle and thinks giving it to Robben over and over again will do the job.
Don't get me wrong, he does what He does well, but truly brilliant managers like Mourinho know how to mix it up to compensate for a circumstance in any given game. See lat night for an example.