I can take a website seriously if they don't bother to remove placeholder text from their 'About Us'

Same here. I met a lot of people who were doing excellent jobs in what they did even if their presentation and marketing was not at the same level.

I can take a website seriously if they don't bother to remove placeholder text from their 'About Us'

Can't take a comment like this seriously when they can't even proofread their own comment...