My love of holidays is directly related to traditions (aside from the meaning behind them, which I assume is implied already). I love Christmas, Thanksgiving and New Years because because my family meets, candlelight services, parties with friends. New Years, which is actually my anniversary date with my ex-husband, isn't even spoiled now because friends gather together to play games and fellowship, and that joy and love overflow and cover any sad memories.
Valentines Day just sort of comes and goes without much thought. Easter is spiritually the most significant holiday for me, though there aren't a lot of spiritual traditions tied to it (I should change that, really).
Black Friday is not a holiday in itself, but I would have to choose that as the "most hated". Lock your doors and don't go outside, people! It's not safe...