"most people have already done the hard work for you by getting the image looking as good as possible!"
...no, in fact most people do the bare minimum to get the image looking ok before uploading and some don't even go that far. This comment is not aimed at the people talking here, by the way, before anyone takes offence - it's merely a general observation on the photos that are uploaded.
Guys, this doesn't have to become a big issue, surely? I have had a number of shots of mine rejected for a non-level horizon, so I go back, re-edit them and re-upload them. It's an extra 5 minutes work or so. What's the point in making a big fuss, really? Is it getting us anywhere? Here we have another thread with people getting irritated at each other - and it's not achieving anything.
As to a rotation of .5 - 1.0 degree or so, it depends on the subject and the angle, but it can make a difference. Maybe it's being a little too critical on the part of the person screening the pic, but in the time it takes to complain you could have gone back, tweaked the pic, and then uploaded it again.
[I'm not really concerned on this subject one way or the other - I only posted this message to dispel rumours that I have died