I feel that it is not my place (or anyone else's) to judge the rightness or wrongness of a given religious faith. So I will not address whether their beliefs are right or wrong.
I identify Jehovah's Witnesses with three things. First, they are in my mind one of the sects that does the most to proselytize. They are not as common as LDS missionaries, but they are the second most likely to be out doing missionary work in my experience. Second, they are the church that does not believe in celebrating earthly things like birthdays. This also makes them refrain from doing things like the flag salute. Finally, I associate them with refusing medical procedures. They do not reject as many as the Christian Scientists do, but I associate them with this as well.
i think they are only doing what they think is right