It's not broken, it's using vardiff, which starts out at a high difficulty for higher hashrate users. If you're a lower hashrate user, as in this case, it will take a few minutes to ratchet the difficulty down, then it will show accepted shares every 10 seconds or so, +/- 30 seconds.

And at any rate, you can't judge a pool's effectiveness by the rate of accepteds CGminer shows without factoring in the share difficulty, as the pool shares will be multiplied by the difficulty factor. That means that even when the difficulty is high initially, you're solving and getting more difficult shares accepted, which count more than quicker, lower difficulty shares--the total amount of work done is the same, and therefore the amount of coins you will earn is the same.