Oh yeah, I also don't usually rate DNFs unless I somehow got well over halfway through

Mine is maybe a bit more harsh than your way, though I do utilize half stars in my reviews.

5 - as good/loved it as much as my favourite ever book/series 4 - very good/enjoyed it tremendously 3 - it was alright. Don't necessarily regret the experience but will not remember the plot/book itself in a few months 2 - not that enjoyable honestly. Maybe a few good scenes/chapters 1 - there is nothing I enjoyed/appreciated about this book. I might remember it solely because of the lack of enjoyment I had while reading

0 stars(unrated) - giving it a rating felt inappropriate. Usually reserved for very touchy/sensitive memoirs or extremely long short story collections where a single score is just not viable.