1/5 -- I either hated this product or it did not work for me at all. I will give it a 1/5 if the price was negligible, or if I feel like it could work better for someone else... just not for me.
2/5 -- I dislike the product. It has flaws in quality and/or price. I will give it 2/5 if I feel like I can still make use of the product... but regret buying it.
3/5 -- I like the product. It's not necessarily spectacular but not terrible either. I will give it 3/5 if I like it but I feel like it's lacking something or could use some improvement.
4/5 -- I really like the product! Works well and the quality reflects the price and/or product description. I will give it a 4/5 if I feel like it was a worthy buy.
5/5 -- I LOVE the product! This means I could not find any flaws with the product and it worked perfectly for me. I will give it a 5/5 if I feel like it was a worthy buy AND I would repurchase and recommend it.
And here's the little 1/2 guy. He comes around if I really feel that a product needs it.