Great idea - but the execution were lacking. I'll give it 3 out of 5, and the third point mainly for idea and effort. I'm glad I took some notes, because I read it three weeks ago and don't remember much now.
The prose was lacklustre, I found the characters rather flat and unconvincing, especially their relationships. They were more vehicles for ideas than fully realized persons.
I was fine with the scientific explanations, but in general he was 'over-explaining' and giving too many fact at some points, and it broke the flow.
I had to look up when it was first written, as it struck me in the description of right after the first flashforward, that they hardly used the Internet as a news channel, but relied on official sources on TV.
It was very western-world oriented. This is supposed to be a world-wide event, but it stayed fairly firmly in a "western world" of Western Europe, USA and Japan, and it didn't really convince me. The few times countries/continents outside were mentioned, it was a bit like an afterthought.
I didn't remember the ending until you started talking about it here. It was odd, and I'm not sure what the point was, but I had also mostly lost interest by then.
All this said, it could have been worse
It's a neat idea, but I think the short story format would have fitted better.
I liked the idea, and the author seemed reasonably well-grounded in the scientific explanations. The visions were generally interesting - but perhaps a tad optimistic with regards to technology. However, it's difficult to augur, especially about the future
The reactions to the event were well-described - espcially the scene at CERN right after the flashforward, where no-one really knows what has happened.