If you look on the Middlecoin site at miners results you'll see that anyone who mines regularly is paid regularly and the results are more or less in line other script pools. If someone says that the pool doesn't pay they look silly to anyone who checks it out.
I think what the others are pointing out is that if the coins you mined today, at the moment, take several weeks to clear and trade, then you are only paid "regularly" because you bet on the pool long enough to get paid. Yet as nice as it might be (to be paid, regularly, eventually, if you wait long enough) the payment issued in this fashion is neither truly "regular" nor of any use to anyone who mined with the pool for today's prices.
Miners today hash for earnings and earnings only, any pool is only as good as today's payment and any pool that requires some sort of pledge of loyalty long term before those earnings are released is neither good for the miners wallet nor should it be actively popularized or encouraged to join.
Scenario where middlecoin payments are incidentally delayed due to automatic systems failing and exchange/payments lagging is detrimental to miner and will result in losses.
Scenario where middlecoin payments are consciously delayed due to the system being designed to withhold exchanged payments in order to improve statistics in falling market by creating "lag" and issuing payments at last weeks levels is detrimental to miner and will result in losses.