Even though I don't enjoy reading extra puffed best, thrilling, tensionnotseensincestephenking crime books, "I kill" was actually good. It isn't different from other crime stories, we have clichés like an american inspector, complicated love story, drugs, drama and all other necessary ingredients to make 600 pages worth reading. However, the serial-killer story is original, and I hate to admit it, really interesting.
It is not "winning-Pulitzer" good book, but if you cut parts of "google facts about random things like photo-sharpening explained in details" it is definitely worth reading :D