One of the questions that always comes to my mind is whether or not the appraisal in front of me was what was submitted by the original appraiser, and whether the original appraiser is the same individual whose name/signature appear in the report. I've seen altered reports before.
I'm not suggesting this is the case for the appraisal report we're talking about in this thread, but that is another good reason to limit the commentary to the workproduct itself. One *other* reason to stick to what you have in front of you and refrain from commenting on what the appraiser did/didn't do is that the report only shows what the appraiser reported, not necessarily what they developed. They're usually one and the same but a reviewer can't necessarily prove they're one and the same.
And not to get more pedantic than I normally do, but getting mad at an appraiser and allowing it to seep into your review work is like getting mad at a property owner or a client or a property and allowing that to seep into your work. If you can't maintain your personal dispassion with what you're doing in this assignment then you should withdraw from the assignment. You can be annoyed at the individual AFTER you've submitted the impartial and unbiased workproduct.
The role of appraisal review is not inherently adversarial any more than would be the case if you were appraising the property itself. We do observe and report, not search and destroy. Parts is parts.