Above Average. I wanted to vote Excellent for it being well-crafted, well-paced and focused only on the interesting stories, but it still has some glaring logic problems in the premise...
-Why didn't the woman in Hong Kong simply tell Demetri that Mark is the killer before now? The guys shouldn't have had to schlep to Hong Kong to force it out of her. If it was because she thought there was nothing he could do to stop it, she should have changed her mind after the worldwide news story about Gough's predestination-thwarting suicide, and called Demetri to warn him how he can easily save his life.
-Why are Mark and Demetri acting sulky? They've solved the problem! They just need to be on opposite sides of the globe on Murder Day. If Demetri doesn't trust Mark (even though - or perhaps because - he's now acting so obsessively protective of Demetri that I'm starting to wonder what's
really going on with him), then Demetri doesn't have to tell Mark where he's going. Head for the Arctic Circle or Kathmandu. There's no predestination problem anymore, and therefore nothing to fear. Might as well worry about being squashed by an asteroid or hit by a bus on that day.
The ratings have crashed so I guess we'll be lucky to get a full year out of this show. Despite well-crafted episodes like this one, the premise is so screwed up that that's probably for the best.
Just because something's possible doesn't mean it's easy. You can deflect one or two pebbles in an avalanche, but redirecting the entire avalanche is a much more difficult proposition.
The problem is, they don't know if there's an avalanche on the way, or just a couple random pebbles plunking down the hillside. Nobody has any way of knowing whether the visions are 99% likely or .00000099% likely to occur.
Sure, they should err on the side of caution, but why don't they DO THAT? Why not make plans to foil fate in any and all ways? And why spend all this time sulking, when as far as they know, the odds of being hit by a bus before the fateful day are actually higher than whatever it is that they fear happening?
We all live with a certain risk of messy death every day of our lives. We could lock ourselves in the basement and still die from a blood clot in the brain. There's nothing about this scenario that is any different from normal life.
It then got me thinking of her flashforward and whether this vision of herself wasn't actually the alternate reality in which they were married.
If the visions aren't visions of the future at all, but glimpses into a parallel reality (which they might be able to visit when the next flashforward inevitably occurs), that would be an unexpected and interesting twist. Everyone is just assuming they're visions of the future - something that has not been proven, and cannot be proven until/unless they actually occur.
Other than visions and parallel realities, there's also the possibility that the visions are pure hallucination, divorced entirely from reality, but with a hive-mind element that linked certain people based on affinities such as similar jobs or geographic location.