I really love Halloween but I grew up in Canada where its a big deal, every house gave out candy and chocolates, everyone got involved, some homes would spend days getting their house ready as they did for Christmas with decorations etc, a huge thing.
At our Catholic school the older junior high kids would do up a 'haunted house' on the stage of the gymnasium where us little kids would walk in hand in hand and were led through a scary house with 'ghosts', worm buckets (cooked spaghetti) etc, it scared the heck out of us and we loved it! Then we'd have a party and bob for apples, sing, dance etc. So my memories of Halloween are very very positive.
Plus, for us, Halloween and Thanksgiving are usually a couple of weeks apart so its also very much tied into the whole 'harvest' theme as well.
Yes, it is a commercial holiday but I don't think it affects my faith and beliefs at all, I am a practising Catholic and very evangelical and I do not believe Halloween has ever distorted my beliefs, either as a child or adult. I still love it!