Are you talking technically or compositionally or both?
It never ceases to amaze me which pictures are chosen both in underwater and other publications. Our view, as divers who experience what we photograph and see firsthand, is substantially different from the view from above water where our images are often viewed as being of a very alien world indeed. To date I have had one photo published in three different orientations!
The magazine business is mostly orientated at selling magazines not showing superb photographs - a sad but true statement. And all too often images are chosen for reasons which we, the photographers, have no control over and never even get to hear about.
There is also a technical issue, especially as regards digital (and I include scanned images here) reproduction. Sadly, there is a great deal of myth involved with the reproduction of digital files. These can be reproduced superbly - I would say better than film for a given format(!) - but all too often, lazy or ill informed practices make digital reproduction an excuse for poor workmanship. Part of this problem lies with us the photographers. It is all too easy to provide a reasonable-on-screen appearing file which when analysed proves to be spiky, over adjusted and poorly originated. This is not helped by some photographers claiming that jpegs are the way to go (they may work ok but are substantially more prone to over adjustment than RAW files).
So I'd agree there are some lousy images published. We, the photographers, need to educate the users of imagery but this is not easy in a competitive world where professionalism is rather less well regarded than it perhaps used to be.