Well, now that laserboy at ArsTechnica has weighed in, I think we can consider the matter settled. Let's all close the book on this one and head over to Fox News for some insight on foreign policy, then to Slashdot for a nice explanation of copyright law, and finally hit up Penthouse forum for some solid relationship advice.
The title is a pun actually, as the E8 group is technically both "exceptional" and "simple", in the mathematical sense of those terms, if i recall correctly.
I didn't bookmark it and can't immediately find it, but I saw him say that he would be very surprised if his theory was universal truth and that the probability of him being correct was low -- but he thought he had a better shot at it than string theory.
Lubos Motl's a string theorist. String theory is not really a science anymore... it's approaching religion: it's not falsifiable and you can "prove" anything using string theory... literally anything you want. I wouldn't trust his review of any opposing theory. You're better off reading what Lee Smolin or Peter Woit have to say. At least they're objective.
I don't know Lubos Motl, but I'm sure you can be a good scientist working in string theory; ie: trying to make it falsifiable. I'm sure if the argument is "Motl works in string theory => Motl is not a scientist", then it's not a valid argument.
I know about the case "not even wrong" and all that, and I agree. My point is: you can be a good string theorist, as well as you keep objective, as you say. I agree with that. Otherwise, we risk repeating the history: Schwartz was being believed to be nuts, until his team found some new interesting stuff. We don't know if that can happen again...
Reality makes perfect sense if you consider that we're a simulation. Then the fact that solids really aren't is no more surprising than characters in a 3D game finding the same thing -- they aren't solid, they are composed of electrical signals, wtf?!?
I admit this doesn't help explain what's "up a level", other than "some sort of computer".