I gave up after a few levels. Some of it seems more like lucky guessing than legitimate puzzling. While the concept is a good one, some of the "puzzles" are just a bit too obtuse to really be entertaining. One I only solved because I am a nerd and my nerdosity immediately told me what a specific set of data must be. If my mother had been working on that puzzle, she would never have gotten it because she has no knowledge of the existence of the coding system used and would have had no clue how to go about looking it up. Another puzzle gives helpful hints like "no, just type what you are looking at." I didn't know what I was looking at, because it's a weird picture. Eventually I figured out what it was, but apparently you have to know what kind/brand it is, which I really couldn't tell. When I cheated to find out, I learned that it doesn't even want the kind/brand, it wants other info related to that.
I dunno, fun for some but not for all I guess. IMHO a good puzzle, when solved, should have a very clear trail leading you from the initial presentation to the solution. The trick is in finding the proper approach which leads to this trail, but once you've solved it, it should be easy to see how to go A->B->C etc. I played the ilovebees ARG and there was at least one notable puzzle where this wasn't the case, and even after the solution was (FINALLY!) discovered, there was still a lot of What'ing from people trying to figure out how anybody would ever be expected to solve such a thing.