Thanks to Max, from the comments, we've been keeping tabs on the Sixers +/- since the beginning of the season. Here's the spreadsheet, below you'll see find a few highs and lows.
As you can see, there aren't a whole lot of highs from this data. Iguodala retains his spot with the highest net of +4.2. Sammy and Thad are also on the positive side. The worst net on the team belongs to Speights at -3.57. Maybe rebounding is more important than we thought?
You can see the full version of the spreadsheet here, it's a little easier to navigate there. Leave your thoughts in the comments and be sure to check out the Four Factors worksheet as well.