I do rate them on a more emotional level. I don't really care if it was competently put together or had 'errors'. I read for pleasure I'm not doing an academic report or proofreading.

If something is good but I recognise it's not for me I'd probably rate it a 3. Middle-of-the-road, overall meh. 2 and below are things I hated, 4 and above I really liked/loved.