Actually I think if you asked most fans what frustrated them most about Delph it would be that he goes around kicking people and earning yellow cards. I also think that most would have agreed with you a few months ago but recently he's looked a lot more confident on the ball, making some great runs forward and cutting out a lot of the silly mistakes he used to make.
I'm still not certain he'll make it here, but up until recently I would have said he hasn't got a chance so let's hope he keeps improving and we might actually see him fulfill the potential he seemed to have at a young age.