A fair amount of Waller has some bad paranoia, but occasionally he's very insightful.
Just read some of his wild and crazy over the top essays, one of these days. He's got some pretty wacky essays at the Center for Security Policy, which has a few oddballs there.
He's the kind of guy where, you admire some of his facts, but he'll have these James Jesus Angleton like theories of a woke conspiracy right out of the KGB.
One of these guys where you like 27% of his material, but some of the reasoning and certainty is one hop away from Glenn Beck meets J. Edgar Hoover.
So, i'd give him 3 stars for some material, but a zero for trusting his analysis on a bad day.
Well read, insightful and sometimes, totally nuts.