For some reason, my reviews won't show up in the app store so I can't help creators out in reviewing their apps.
It takes a bit of itme for them to appear, i've seen mine on the app store If you delete an app i think after a day or two then the review goes as well, a way to stop all these 'this games great' crappy reviews you see for competitions when you know the kids going to de-install it one second after the competition finishes. If you still have the game installed i'm sure the review will appear
I've found that when I post reviews from my device they don't show. If I post from within iTunes on PC they show up.
I've seen my own reviews a few times before but they certainly can take a long time before they show. If it's intentional then it's slightly disappointing as the first few days on the Appstore are the most important for a new app, although I can sympathise with the obvious argument against it too. I feel like I've heard the suggestion that the app must be installed for a time before the review will show so it could be correct but I can't really confirm it as I only review games I intend to keep on my device generally. Sorry I can't help more though!
The reviews display by default in 'Most useful', as rated by review readers I guess. I found by changing it to 'Newest' (most recent?) then my reviews would be there quite soon. I haven't written many, and can't seem to change my nickname from 2010! Probably an iTunes only edit, else nothing happens.