A lot of people aren't going to like At First Sight. A big reason for this is that the central character is a self absorbed, intolerant, jerk. Personally, I like novels with flawed, even detestable characters, as long as they are interesting and/or entertaining.
This is one of two significant drawbacks to the novel. Chick is boring as hell. He's superficial and whiny. It's always risky for an author to build a novel around a character who is unlikeable, and I have to admire Cannell for trying. I suspect a lot of people will give up on this novel about of the third of the way through (probably about the time Chick gratifies himself with a Hustler magazine in his car after killing someone) because they were either bored to death by Chick or just found him too unpleasant to read about. I think Cannell would have been more successful in his attempt if he had been able to incorporate a little morbid humor into the narrative in the first half. With the right tone, creepy behavior can become darkly funny.
And this happens to a degree in the final third of the novel (for those willing to stick with it). The narrative alternates between Chick and the woman he is obsessed with, and there is some morbid humor in the stark contrast between his perspective and hers. His thought process and behavior becomes more and more outrageous and delusional near the end and this adds to the entertainment value.
The second significant shortcoming of the novel is its lack of originality. For some reason, Cannell seems to think that he is writing something groundbreaking here. He says friends begged him not to write the novel, that he'd been harboring the idea for years and that it simply poured out of him when he started to write, as if it were something unique and special. It isn't. The novel's premise, a man becomes obsessed with another man's wife and then kills him so he can romance the widow is not new. Frankly the whole thing is a tired re-tread. I think the only semi-original idea here is that Cannell made Chick uncompromisingly unlikeable, and wrote most of the novel from his point of view.
On a positive note, the novel is lean and mean, and Cannell does a reasonable job of building suspense in the final chapters. I started to find Chick's antics reasonably entertaining near the end and appreciated the alternating narratives. I like that Paige, the object of his obsession, is a reasonably intelligent and resourceful woman. Her guilt and grief make her vulnerable and leads to some choices that put her at risk, but for the most part, she see's Chick for what he is.
While there are some positives to the novel, it isn't one I can recommend without reservations (if at all). The story is predictable and lacks originality and Chick's rants remind me of a loudmouth drunk in a bar that you wish would move to another stool. If you're thinking about giving up halfway through, I can tell you that it does get better, but only marginally. 2 stars.