I actually think if welbeck could sort his head out he'd be an absolutely gun forward, he has pace, presence, quick feet and control, the problem with him is he thinks in terms of the highlights reel and not in effective football.
he's not direct enough in his decision making but he has the ability to get himself in to positions to make decisions.
also, it's funny how the timing of an incident can effect how dramatic it is, the disallowed goal* in the first three minutes was one of the most rubbish decisions I've seen. high feet for taking the ball off a player who was stooping down and it hadn't even made his head AND he played the bottom of the ball? I've watched it again on youtube and his foot is barely above his waist.
*it's arguable he wouldn't have scored seeing as the whistle did go and who knows who heard it, whether the bayern players had stopped or even welbeck had only been able to lash the ball into the net because he wasn't under any pressure.