I don't think they're dirty at all. Don't forget to consider the quality of the camera used, how far the snare on the far left is from the far right, and that it's GOING to sound a little off because they're that far away. Not to mention the wall behind them is bounding back half of their sound. So you've got 4 different spots that the sound is coming from at four different points: the far left, the far right, the reverbed far left, and the reverbed far right. I'm sure they're fine in person.
I don't think they're dirty at all. Don't forget to consider the quality of the camera used, how far the snare on the far left is from the far right, and that it's GOING to sound a little off because they're that far away. Not to mention the wall behind them is bounding back half of their sound. So you've got 4 different spots that the sound is coming from at four different points: the far left, the far right, the reverbed far left, and the reverbed far right. I'm sure they're fine in person.
Ouch...