DDG aka "The Cat" is an excellent shot stopper up there with the best Spanish GK like Casillas and Valdez but then he also suffers from their weakness in the air.
His aerial game will take time to develop as he gains strength, experience, confidence and hones his skills.
No way is he anywhere near that Valdes.
Far away and ahead of Valdes in shot stopping.
Have you noticed that in the CL knockout stages in the last few years, Valdes often has conceded from the only 1-2 shots that have come his way? Sometimes, no shot on target, and he's conceded (own goal, not his fault).
But yeah. He's conceded 100% of the shots, a lot of the time in CL knockouts, which is really the only time i see him play.
Arsenal x2, Milan x4, us, chelsea x2 Rooney, 1 chance, 1 shot, 1 goal.
MIlan, few shots, most of them go in. Arsenal get a shot from a 20% angle to the touchline, beat him near post etc. Against Chelsea, don't think he really had any hard shots to save, but conceded several.
On the European stage at least, his shot stopping record has been terrible.
I'm not counting when he plays shit sides that only get to shoot at him from 35 yards.
By the by, there's not a single GK in the world I'd swap him for, considering his age etc. (de gea, that is).
Already I personally rate him in the top 3 GK's in the world.