While this comment is rather unenlightened and shallow (sorry, but it was) it does reveal a particularily common view of all this.

The problem with their "gaussian" method and their "historic and hidden" number is that players want to game the system and find the best way to advance in it, as should be expected btw!

The reality is that this system is very well thought out, appears to be extremely accurate from what they have said and has solved several problems that used to occur that were game breakers for many people: namely ganking and buying arena points.
(if only they solved the other glaring PVP issues such as class imbalance and survivability!?)

What I find intensely amusing (and disappointing) is that the whining and complaining of players during this initial period has led them to make a very fundamental change which has resulted in all of us never being able to know our hidden score: personal ratings now tend towards our team rating rather than our hidden rating. (previously it was the other way around)

Yes that is right folks. Some people's whining and complaining has made it 1000% harder for us more patient and intellegent people to know our hidden rating or at least how hot or cold we were from it. (by how our personal tracked)
I am not sure why the hidden rating is hidden at all, but that is another disscussion.

Regardless. The more we all play, the better the system will learn and adjust over time and the trends will be less severe. This is how the gaussian method works and how it is going to stay for now. Just deal with it.
The fact that it very accurately predicting the outcome of matches and therefore performance should be the only thing we (and blizzard) really worry about! it appears they have already nailed that.