I agree, a good photo is a good photo. But for me, personally, there ARE subjects I *like* better than others, and so I guess I'd say that I experience "levels of appreciation" for a good photo. With birds specifically, that means that yeah, I tend to "appreciate" the "cooler" birds more--the hawks, the eagles, the herons, unusual or brightly colored birds. AND I tend to like it better when I can either really see the bird's eye, or if it is doing something interesting.
So, a picture of a gull's underside (and I'm TRULY not knocking it--I have my OWN pictures like this, only not as well done) is not quite as high on my "levels of appreciation" as a GOOD picture of a hawk's or eagle's underside. BUT, a picture of a gull where I could see its eye, or where it is "doing" something interesting--diving, shrieking, something--would be higher on my appreciation levels than a raptor's underside.
That may make sense to absolutely no one but me--but it's the way my little world works. It's complicated being me.
