1.4 dWAR. That's a big number. anything over 1 full defensive win is a strong performance at one's position. Dustin Pedroia is a Gold Glove nominee on the back of 1.8 dWAR at second base. JBJ is at 1.6 and is probably going to win a GG. Considering that he wasn't out there in every single situation like those two were, Shaw had a very, very, very good defensive season.
Shaw's not flashy, but he's right up there with the best according to Baseball-Reference. And really, did you see Shaw make any great number of mistakes at third this year? Because I didn't. He's very very sound fundamentally as a defensive 3Bman and quietly does his defensive job extremely well. Not bad for a guy who hadn't played 3B full time in years prior to this season.
For comparison's sake -- Mike Lowell, Gold Glover and widely considered to be an excellent defensive 3B in his prime, well known for his excellent reflexes and fantastic throwing arm that definitely saved some runs for us before he started to break down in 09, never had a year in which he put up 1 dWAR. He came close in 08 with 0.9. By that standard, Shaw has already put up a better defensive year than at least one Gold Glove winner ever had.