Do any of you want honest critiques of your work?
Well, I do, and I don't often get any critiques. I don't put C&C Welcome on every post like some do, and it's not in my footer, but that's from laziness. I just don't feel like typing that stuff out each time I post a shot, I assume it's understood.
In your case, there are no flaws to point out. Or none I can see. Your bird shots are awe inspiring, and I doubt many here see anything bad to point out and maybe wouldn't if they did. I have asked questions about how you did shoot some and got answers, but mostly I just drool and view your EXIF, wishing I could afford better equipment.
Jim, I think most of the bird regulars know who you are and would certainly appreciate some how to do it better criticism from a pro. I know I would. Which brings up another point. It's really not good enough to just post our own stuff and answer questions in our own thread. It really goes a long way on the point system to spend time viewing and posting a comment about others work in their threads.
The worst thing that can happen to a person who whipped up the courage to post one of their not so good shots is to see it drop off the bottom with no one posting anything. POTN would become a forum of the elite in no time at all if people didn't take the time to make some sort of comment in threads started by the not so good photographers among us. What makes POTN the best is exactly what you questioned, "Is this a showcase forum, a critique forum, or both." It's both IMO, some come to showcase, others come here to post their stuff for critique so they can become better. Everyone has a different core reason I think, but it all boils down to people wanting to post their shots and see what others have to say. I think we all are aware what others say may not be what we wanted to hear, but those are the chances we have to take. It's like any other community, we all have to commune together to make it what it is. 