"The bad: Samsung charges too much for extra features that are largely unnecessary and poorly implemented. Its picture delivers slightly worse shadow detail and bright-room performance than some competitive plasmas, and its maximum light output is somewhat dim."
"It's also worth noting that the 60-inch E8000 couldn't get as bright as the 55-inch ST50, maxing out at 30 FL in Movie mode and making it unable to achieve our target of 40. Larger plasmas are generally dimmer, but even so I expected the E8000 to get brighter. Last year's 59-inch Samsungs had no trouble getting to 40 in Movie mode."
I'm not suggesting that it is actually dim. In fact, I think once my set has the proper settings dialed in (still breaking it in right now) I think it will be more than bright enough. But it does sound like CNET found it a bit dim compared to other sets.