Today I had a dream where all my doubts and misunderstandings were vanished. Somebody in my mind has described Max PPS to me 
It's in its essence, very simple : you don't get paid as much as you should when you contribute on "lucky" blocks. You have to contribute to the "unlucky" blocks too to get all your rewards. Thus eliminating the motive for pool hoppers (that try only to contribute to "lucky" blocks).
It's also, in my opinion, better for the mood to see the reward going up more than expected on otherwise long blocks.
Now, of course, the math behind is not simple, but the principle is really clever and easily understandable.
Artefact2, I think we all understand the problem of pool hopping. However, I don't think you understand the objections to this system.
The system requires the pool to withhold miners' earnings to buffer them out. However, this is done:
- According to a secret formula, which I cannot find anywhere
- Using a '40% complete' implementation, with a vague promise to implement the extra 60% that will make it completely fair at some unspecified later date
- With no mechanism, as far as I can tell, for legitimate miners to ultimately cash out their 'buffered' earnings
Furthermore, this was done without warning and the explanations to date have been lacking or dismissive.