1 star - A work with minimal or no positive qualities, a 1-star rating indicates that I had to struggle hard to finish it and most likely skimmed large portions. Would probably be considered "did not finish" if I ever didn't finish books!
2 stars - Works earn 2 stars when they have strong points, but those are outweighed by the weaknesses. May involve skimming sections, lack of interest in characters/plot, or bad writing. Would not re-read.
3 stars - A work with good points and bad points that didn't particularly impress me, but was overall enjoyable. While not high on my list, would potentially re-read.
4 stars - Strong works with a one or two flaws normally earns 4 stars. The flaws normally fall into the "It didn't grab me" category, although pacing, singular unbelievable events, or other weaknesses will bump it down as well.
5 stars - Perfect or practically perfect, a work with this star rating not only earns strong marks in writing, plot, and characters, it also is emotionally moving. Minor weaknesses due to preference, minor pet peeves, or other inconsequentials are permitted if few in number.