Ziggler, Christian, Rollins in the conversation. Rollins bumps are out of this world. Orton when in there with good people. Same for Cena.
Jericho would come in for me @ #6...I thought he had a really strong year...he came in right way working strong TV matches. The Fandango WM PPV sucked, but Fandango isn't a good in-ring worker and it was his first actual match under the lights. But he has followed it up with some strong work with Punk at a PPV and some more strong TV work.
I gotta throw in my boy KREW-GAAAAAA if we are expanding the list to 10+...thinking back, since the Observer year starter, he's been consistently pretty damn good on NXT.
Obviously Ziggles is in there. I am not sure where I place him. I can obviously see a +workrate guy, and he has flashes of it, but he hasn't worked with anyone that can really bring a ****+ match out of him yet. (edit - he had a really good match with Punk last year) I've seen Punk and Bryan get fantastic TV quality matches out of Mark Henry. I really like Ziggler, but I think there is a cutoff line from that elite group and then Ziggles. Ziggles and Rollins are bump machines. They have made a lot of guys look good because of it.
Orton needs a really high end worker to get something really good out of him. He's down on the list, IMO. Young Lex Luger-esque just an obviously better athlete. Personally, I don't like watching Orton unless he's in there with someone I really like.
Cena is always the most underrated worker. Once in a while he has a match with a lesser guy that he really has a solid match with and he can be taken to ***** with the right people and hold up his end and then some. If there is a most underrated worker every year, its probably Cena, simply because everyone shits on him, but he's always got a few "Best of" matches in the WWE by year's end.