While tracing is an acceptable means of achieving specific goals in the professional art world, it is nevertheless a much lesser means of doing so than actual illustration, and over-reliance upon one lazy shortcut has severely hampered Land's work. Could he draw back in the days of Nightwing? Sure. Can he still? Who knows?

So, is it then "morally wrong?" Not really. It depends on how you feel about laziness. But seeing Sandra Bullock Onnnnne Morrrrre Tiiiiiime isn't doing anyone any favors either. 

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It depends on what exactly you are doing. Each situation can be different. There are times when it is very cost effecting to just trace a photo. The artist doesn't have to think about figure lay out or construction of the figure. 

It also helps when trying to capture the likeness of the subject. When working in a field where time is at a premium. When there is a deadline looming. You have to do whatever it takes to get the job done. 

I've done portraits for clients. I can capture likeness fairly well just from working from a photo reference. But it is very time consuming for me. Because I agonize over every little detail.  If I use a lightbox to lay out the feature so I've gotten the likeness accurately done. I have more time to devote to the shading and finishing details of the photo. Which also allows me to finish faster and work on other projects.

second, whether you've "borrowed" a photo or taken you're own... know where the photo stops and the creativity begins. Know the limitations of your source material. Slavishly copying, especially in sequential art destroys the flow.

I'll say this about Lands use of photo's. It appears to me that he is relying to heavily on them. I think he should change them up a bit. Instead of sticking to every detail of the photo.