Hes definitely the most solid in terms of his general game. AWB is better defensively, but Shaw is a very good defender as well, and tidy on the ball.
His attacking output could be better, but overall his game is very rounded, without being spectacular in any department.
That leg break, along with Mourinho, really did a number on him. 5 years later and he still looks like he's only coming back into form and self belief again.
Solid player, and looks to have sorted out his fitness and injury issues as well. LB has gone from an area in desperate need of upgrade to a luxury position in terms of when to buy another.