I feel like my experience with this pool is far different than some others. My payouts have been consistently under the announced btc/mh. For instance, I moved my 2.7 mhs to the pool around 24 hours ago. My account already had a balance of around .007 btc and my payout today was only .0175 btc. I am not experiencing a large amount of hw errors or rejects. Today was the biggest discrepancy between the announced payout and my payout but I have almost always been lower than expected. I am using the same settings as I do on dozens of other pools where I consistently get paid approximately what I expect to get paid. This is the first multi pool I've used and it has been very disappointing. I'm pretty sure I would make way more just mining LTC.
Hang in there. I've got 7 cards (5 290's and 2 280x's) pointed at this pool, and while over the last few days I've had VERY good payouts (0.04->0.06 btc/day), the last 2 days have been dismal (~0.03 btc). I'm attributing this to the profitability of the coins, and not the pool, so I'm hanging in there (it's still profitable so why not). Give it some time and things may improve, TMB has so far been the best pool in terms of payouts that I've found.