I personally hate the holiday. kids dress up as monsters and parade around, asking for candy? I think it's a bit dangerous, for starters, for children to go door-to-door for treats. who knows if their tampered with? what if the child is stolen from the porch by the homeowner? also, I know it's a Pagan holiday, so I don't see why any Christian, Jew or Muslim should celebrate it. I think it's OK to add some superstition and cultural trends to Church feast days, such as Christmas (Santa, elves, presents, etc.)
and this is just a personal one. But every Holloween, my sister goes with her friends, my mother goes to bed early, and I'm left to hand out candy! last year, I just wanted to read a good book, and I kept getting interrupted by "trick or treat".
for religous reasons, I don't think it's apropreate for Orthodox Christians to celebrate Halloween. it's interesting the way our culture is... we get 2 weeks off for Christmas, but, at school, nobody has ever even heard of Holy Theophany! and my priest says that we should try to take time off of school and work to come to Church on this day.