Who made  http://poolpicker.eu/ ?
If it's accurate the conclusion is: They're all about the same so just relax. 

http://poolpicker.eu/ should have the LTC line on there to show what a standard mining of LTC would do as Middlecoin over the last week has been significantly lower than that. Normally MC would have a few bad days then have a significant 'overpayment' day that made up for it. That hasn't happened this time. h20 has been sitting on over 200+ unexchanged for weeks! When was the last time this pool was under 20-30BTC unexchanged? Its been at least a month. Those are your coins he's hoarding, claiming you earned but not giving them to you. How is it he still has 13GH/s here? The last week he's been worse than LTC and people still stay. I'll come back when http://poolpicker.eu/ shows he's back on his game but not before.