Another $.02 -
Yes his vision appears to be solid.
However, as was said earlier, his craftmanship is marginal.
How much of that is the effect of financial concerns ( if bigger sells better, lets make it a lot bigger), and how much of that is a part of his intent in his artistic approach is something only he can answer.
To say that you need to expect defects to be obvious in any size exhibition print is to negate the talent and skill of those that wouldn't dream of letting those things out for display.
The vision thing is extremely important, but the full follow through from previsualization to presentation is the real deal.
Just another opintion...