I'm on my fifth one (1200TT) and they're not the neatest of books, though they're not THAT scruffy. I think if you're learning, you'll fly here and there, fill in with different pens etc, but if you're flying the line, you tend to do it every day at the end of the day with the same pen you keep in your flight bag. Mine look like that and I suspect ghat most people's do too.
So absolutely, it makes them look genuine.
I have a spreadsheet with everything entered in as well, so that's about as neat as you can get if they want neatness.