This is probably going to sound like i'm talking down to you, but on the internet especially you can't treat your opinions like a delicate piece of bone china that can't be touched. Once it's out there you have to be prepared for people to poke and prod or even try and throw it against a wall. FWIW, I agree with your view that six years is too long, but I also believe that he won't serve that length of time and the actual term he serves is going to about right, IMO. As you said yourself, there is a big inconsistency when it comes to sentencing and it can seem crazy when comparing crimes against other crimes, but I think the counter argument is that sentencing has to be open, because the degrees in certain crimes can be so vast. In this case the judge could of gone as far as 10 years. So AJ has not had the book thrown at him. Always share your views and remember that if people don't agree they're far more likely to reply than someone who does.
http://news.sky.com/story/1677134/adam-johnson-appeals-child-sex-sentence Johnson now appealing against his 6 year sentence.