While Jesus Christ appears to be an important part of JW doctrine, I’m not sure Jehovah’s Witnesses fit the general description of a Christian denomination (assuming Christian implies the doctrinal teachings point to Jesus as a Savior; JW doctrine as far as I know considers him to be more of a prophet). I have seen questions about Jehovah’s Witnesses on this site before, usually comparing their doctrine to that of other denominations. Is it on topic to ask questions purely about JW doctrine? If not, which other site would be best suited for those kinds of questions?
Yes. This question has come up before several times, and the consensus has been that Jehovah's Witnesses are "Christians" for the purposes of this site. See:
It boils down to any group that self-identifies as "Christian" is on-topic here (see the accepted answer to the first question and Affable Geek's answer to the second).