It can deliver while still being flawed; personal favorite isn't necessarily synonymous with being comparatively superlative. Personally, I don't particularly care whether someone 'accepts' that or not, but I will say that the failure to acknowledge said flaws is equally, if not more, arrogant and wrong. Makes me think of the parent who refuses to believe that their misfit child is anything but an angel. It's love, sure, but it's still not very rational or reasonable.
With that being said, I don't think anyone is telling anybody else not to enjoy the film. It's entirely possible to like something in spite of it's flaws, and I'm pretty sure we all understand that.