You're talking about the "unreliable narrator" which works when you've got a known, understood situation. "Who is Keyser Soze?" "What happened on the forest path?"

It doesn't work in Blindsight. It doesn't work at all.

You use unreliable narrators to give differing perspectives on a knowable thing. Even that last stupid little twist in Contact - "did she imagine the whole thing?" exists only to serve the purpose that the faithful deal with the doubts of others when they are certain of themselves. In Blindsight, Watts uses it to mask the fact that he hasn't figured out what the fuck he's doing, that he hasn't thought out the motivations of any of the characters, that he's constructed a society destined to implode and that the driving force behind his plot developments depends on logically inconsistent behavior from an entity that, according to his own story rules, can't exist.

"I dunno... maybe it happened this way! Maybe it happened that way! You're the audience, you figure it out."

No, asshole, write a decent story that doesn't have Great Pacific Gyre-sized plotholes so you don't have to hide behind "maybe I'm lying to you right now. You'll never know! 'cuz I'm so EDGY!"

Sorry. Fucking HATED that book.