
I would have to agree. When you have lived with dogs of varying quality, it isn't until you have the quality animals that you realise the shortcomings of your beloved less quality ones, and why they never did anything memorable, though you had fun showing them.
It also doesn't/shouldn't blind you to the failings of the better ones either

That is called Kennel Blindness, you should find that you actually get more and more critical the longer your at it.
Judging is of course about virtues, so you should be able to see these bearing in mind the shortcomings.
Not everyone is suited to judging, or wants to judge no matter how experienced or knowledgeable. it is one thing being able to assess the qualities of ones own breeding and then that of potential mates, but something altogether different weighing up the relative merits and demerits of dogs to put them in order of merit, usually the first and last are easiest, but the ones in the middle hardest. This takes a lot of concentration among other things.