What parts of the board could cause electronics professionals to think it was constructed poorly, quickly, or unprofessionally? Is it simply soldering, a lack of clean trimming, or placement of the components themselves?
I'm an electronics professional and I understand what it takes to layout a PCB to meet a design goal and price. Placement is part of the PCB layout - seems fine to me but then I've been hanging around on the forum's to understand some of the constraints and all of the design goals. I have 4 Pi's, all of which look like they were manufactured with care, no poor trimming, no poor soldering.
Short answer to your question, in my opinion, is NO.
One wonders about your motives for asking the question.