I'm sorry, but I'm not sure which reviews you're referring to, so I unfortunately can't speak directly to their concerns. What I can tell you is that our printers are calibrated to meet the highest industry standards. We do not employ any color correction on your photos - we print exactly what we receive - while many other company do color correct your images before printing. This can result in customers perceiving the quality of images to be different, though it would be impossible for us to exactly match the color adjustments another company has made :) It's important to carefully review your photos in our application using Preview mode to make sure they look the way you want before placing your order.
If you have specific questions about your images, please feel free to chat with our support team - they'll be happy to help.
Hope this helps!
Nov 20, 2012