Do you review off of just the watching experience alone?

I've just watched 'Funeral Parade of Roses' and whilst I was watching it I liked what I was seeing but didn't understand the narrative (due to being very tired). After watching the film I read a plot summary and have found my overall enjoyment to be far higher than before as I was able to piece together the film in my head.

Would you guys reflect this in a review and rating or would you review the film based off of your initial impression without any external influence?