I dug a little deeper into Powell's past and it's ugly. I checked out his regularized adjusted plus/minus (basically a more complex/precise version of plus/minus) ... and wow. I said he might be the worst player in the NBA -- that was being kind. The guy is literally the worst thing the NBA has seen in the last decade.
Each season, he's been consistently horrible. It doesn't matter what team he's on or what system he plays in. Powell is a disaster.
2007 - 5th worst regularized adjusted plus/minus in the entire NBA
2008 - 2nd worst (And this was the best season of his career)
2009 - Worst (I'm talking the entire NBA, mind you)
2010 - Worst (back-to-back years? wow)
2011 - 3rd worst
That's five straight seasons being in the top five worst players in regularized adjusted plus/minus. That's a stunning feat. He played for five different teams in those five seasons and yet consistently had a huge negative impact at each stop.
It'd be difficult to accomplish that amount of suck even if you are trying to do that. First, you have to stick in the league for that long. Second, you have to keep tricking coaches into thinking you can help. Third, you have to be horrendously bad without it being too obvious.
I rarely come to a definite conclusion based solely on stats put these numbers are simply overwhelming. I don't care how good he plays in preseason, Josh Powell should not make the regular season roster. Period. End of story.
P.S.
In case you were wondering, guess who has the lowest regularized adjusted plus/minus over the last decade? Yep, our friend Josh Powell.
Congrats on the hot streak, Mr. Powell, but kindly GTFO before Pop mistakenly thinks you deserve regular season minutes.