If you have a seperate worker for each rig you would know when one of them was out of wack because it would show no shares on the current round or an extremely low score if you caught it durring the same round it stopped.
So you find it absolutely okay that to get this information you have to go to statistics and scroll down?
It's the worst thing in slush's pool. Also there are many other inconveniences, like lack of not averaged workers speed, withdrawals by something like "1.000001222" btc, no configuration examples, no NMC mining with no namecoin wallet...
Slush's pools is most profitable for me, so I really appreciate work done by him, but I always want for something better :-)