It should depend on quality and time the author has. Just because something isn't insanely detailed doesn't mean they have a lot of time on their hands. Some people have a JOB or two or three. I myself have 3 jobs which is why I can only do one page a week. They aren't insanely detailed paintings, but my pencils can take a day or so, my inks a day or two and then my colors take a day. So that's 3-4 days to make a page balancing between my other jobs and the comic.
It's NOT far for anyone to be judging people on how lazy they are in updating based on the quality they post.
Now, if they are making a million updates a week with random artwork instead of pages, then I'd be concerned. But if you can't prove they are goofing off, you shouldn't be judging.