I've already gone over this and posted a video of what counts as a chance created. Any chance created that results in a shot in target counts as a created chance. So if Ozil pulls a Hleb and cuts the ball back to a player that's getting charged down and the shot gets blocked, that still counts as a chance created.
It speaks nothing of the quality. Also, it's a worry if he can't find quality strikers like Aube and Laca to finish chances. For example, if he's creating chances for overlapping wingbacks to blast into the side netting that's not something to rave about. We often get so congested down the middle there is no where else to go but wide and it ends up at the feet of the least threatening player. Unless you're Monreal.
Same goes if he's taking corners that result in a tame header or something that goes well wide. Those aren't chances to write or home about. Most of what he creates doesn't put the key players into great positions.