I must admit I'm not too keen on flat faced Persians. It's not the flat nose so much as the low lying eyes. I find their faces a bit disturbing, especially in some very extreme cats. I also know that too many of these cats suffer from health problems, especially with eyes, sinuses and breathing and I think that breeding to such extremeties is not fair towards the cats.
I also don't like seeing flat faced dog breeds. It's even worse with dogs, as they always seem to be panting and have difficulty breathing - you can actually hear them wheezing all the time, poor little things.
I really don't understand why they don't let doll-face Persians compete in shows. I think that flat-faced are so different from old fashioned Persians they deserve to have a category of themselves. I really don't think there are many breeds that looks like doll-faced Persians. I think they have a distinctive look and are easy to tell apart from any other cat.
Just my 2 cents