In general I actually have a pretty bad sense of smell, but when I do notice smells my reaction is often polarized.
I love the smell of cedar and pine, many flowers, lasagna baking in the oven, mint, cinnamon, vanilla, lemon, lavender.
Smells I find repulsive include many fruits (peaches, mangoes, pears, etc), new cars (I bought a 3 year old car and promptly rolled down all the windows and sprayed the entire inside with an essential oil mist to make it bearable), heavy perfumes (like the perfume shops in malls), fish, alcohol, and dumpsters.