I've only been looking at this site for a few weeks, and uploading stuff for less time still. At a paltry 150 pics in the database, I am hardly qualified to comment, but sorry, I will...
If photographers stop uploading creative shots, just so that they can get their "standard" shots uploaded more quickly (due to the risk of some of the "creatives" being rejected), then that is a huge loss for airliners.net. Just take a look at the best shots from the front page - how many of them are standard side on ramp shots? Not many. By not taking "risks", do we risk loosing those best shots in future? I hope not.
I guess it comes down to what you think airliners.net is for. If it is a showcase for individual photographers to present as many of their photographs as is possible as quikly as possible, then fine, everyone should revert to sunny, side on, ramp shots with no junk in the way. If on the other hand airliners.net is the premiere place to go to see the whole range of aircraft pictures, some standard and some creative, irrespective of the photographer who took them, then we should stop worrying about rejection rates and keep uploading great photographs - its likely that the good ones will get there, whether it takes a day, a week or longer.
As I said, I have only recently started offering pictures to airliners.net, and of course I am sensitive to my own rejection rate - we're talking egos here to some extent. Of course it would also be nice to see stuff uploaded within 24 hours of offering it every time, but to me quick acceptance is not the be-all and end-all. I will continue to upload pictures that I personnally like, and pictures of aircraft that I think are interesting or have not been featured before. If the consequences of doing this are that my photos take a week to appear, or I get a some rejects along the way, so be it... I only offer stuff I think is worthy of being accepted, and if what I offer gets rejected, that 's airliners.net's loss and not mine.
If we want measure our own work, surely a more reliable way of doing so is to look at the hit rate on our accepted pictures, and not to worry so much about our rejection rate or the time it takes to get our pictures accepted.