i love ouija boards! i used them with friends, i play with them with my siblings, they are super fun and a tad spooky twisted . i dunno if they really really work, but everytime i use it with someone it always works. it just doesn't work if someone doesn't believe, or if someone doesn't have a good enough patience for it.
are they bad? no. i don't see anything bad with trying to communicate with the dead. i think it's cool. but then again, i'm not religious.