As far as Orton goes, people saw him as an upgrade to Cassel, and I think that's it. He's still a below average NFL QB.
Try this on for size. Profootballfocus grades every play of every game for every player. Here is where Cassel ranked among QBs from 2008-2012:
2010 (best season): 20th
2011: 21st (Orton was 22nd)
Again, this screams BELOW AVERAGE.
The only QBs Cassel has graded out better than this year are Andy Dalton, Brandon Weeden, and Ryan Fitzpatrick.