A few things regarding their use of the name Jehovah and claiming it's a big deal:
Actually, it's supposed to be Yahweh. NOT Jehovah.
AFAIK, technically, even Yahweh isn't God's actual name, it's more like a title you can address him by. It was once believed that knowing the name of someone--even a god--gave you power over them. So Yahweh didn't allow his true name to be known. Of course, that's secular historian stuff. (I am an atheist, mind you.)
Yet the WTS claims that switching from Jehovah to Yahweh doesn't matter even though they make a big deal out of using God's real name. ???? That makes no sense. Either God cares that you use his title correctly or he doesn't. Pick one. If he doesn't care, then we should be able to call him God, Yahweh, or Jim Bob. Why would it matter?
It would all make more sense if they just changed their name to Yahweh's Witnesses. Then again, Jehovah's Witnesses is kind of like their brand name now. Nobody would know who they were if they did that.
Regarding the changes to their teachings and the claim they have a direct line to Jesus:
I just don't see any reason to think they're any more likely to have this connection than any other religion. The GB seems to be claiming that Jesus somehow manipulates their decisions from afar, like a feint shadow on their minds, instead of just popping down to WT headquarters or making a phone call and telling them what to do or what to teach. If Jesus really wanted the WTS to be his true religion, why not guide them more directly? Why would the WTs divine leader choose to lead with a whisper the GB can barely hear at the best of times instead of sending them visions, or making each of them reach the same conclusions at the same time? (That would actually be quite impressive when you think about it.) Unless, of course, that divine connection doesn't exist and they're no more divinely inspired than any other group.
And how can they say they're getting closer to the God's real "truth" when they keep backpedalling on their decisions? If Jesus were truly "nudging" them in the right direction by subtle supernatural means, you'd expect some consistency. Instead, the GB are more like the Supreme Court. They change their minds with the times, probably when new members are added, etc. Just like any human-run organization would do without any kind of divine inspiration whatsoever. And if Jesus isn't helping them reach their decisions, then they're just a bunch of old dudes with high opinions of themselves.
Note that articles written online by former Bethelites and members of the writing committee seem to suggest it's the writing committee who comes up with most of their great ideas. Or at least many of them. Not the GB. JWs seem to think the GB spends its days in libraries full of dusty old books, expertly translating and thinking and philosphizing. It seems this is not the case. Unless you assume those former believers are just a bunch of lying apostates, of course.
I see nothing that truly makes the WTS special, remarkable, or otherwise noteworthy as a group. Nothing seems to mark them as being right except stuff they made up themselves. They are kinda weird by modern societal standards, but so are other groups. Others have similar beliefs. Others preach door to door in many nations. Even if they are in more countries, wouldn't Satan support a group that misleads Christians too? Maybe that's why they are in the most nations. (Let's not even mention how many of those nations only have, like, 2 Witnesses in them...)
Sorry, this post is too long. :-( My bad. But I could go on...