There are several things you've said you disliked; most vocally, predictions of a (positive?) Singularity and HPMOR. However, you haven't argued against them much, just said you disliked them.
If what you're trying to do is just putting up signs reading "Not everyone on LW likes this", this probably works. But I (and presumbably most people who either like or dislike those things) would like to hear your arguments for it in more detail, preferably with some back-and-forth if you're willing to engage. What's in it for you is that it can actually improve the consensus, as opposed to sticking a little [disputed] banner on it.
Concerning Less Wrong's tagline, consider this plausible reaction of someone looking at LW for the first time:
And here are two real quotes from 2009:
And in reply:
The quoted text speaks for itself really. So therefore I think LW's admins/web designers should seriously consider replacing the rationality tagline with something more savory.