It is mostly boring and silly, but Zak is easy on the eyes IMDb puts this program in the categories History / Sci-Fi / Thriller. My satellite TV guide refers to it as Paranormal Series. I would categorize it as Sci-Fi / Supernatural / Sad attempt at Thriller. In the name of full disclosure, I've never seen a fake reality show or movie that I liked, horror shows are not often my favorite entertainment, but I occasionally do like horror films. I frequently like history, documentaries, Sci-Fi, science, and supernatural shows.
I do give Ghost Adventures a bit of a pass because it is categorized as Sci-Fi and Paranormal; by definition that means it is fictional, and outside our human understanding of the natural world. On the up side, I can see how some might be entertained by the silly antics the host, Zak Bagans, and his team (Zak is handsome and has a great body, but would be better looking if he'd just stop talking). I mean the guys seem to believe that every creaking board is a ghost, and every breeze is a demon. They also seems to think they can intimidate supernatural entities by yelling at them, and calling them names. To see grown men acting like that is quite humorous, and intentionally so, because if grown men did actually believe that silliness, it would be just too sad to bear.
The down side of Ghost Adventures is that it is filmed in the Reality TV style, and the guys are either fooling themselves or attempting to fool their audience into thinking they are collecting "evidence of paranormal activity." As I've written in other program reviews, when people mix Reality TV with Supernatural, the only possible outcomes are silly humor, or significant boredom. Luckily, GH has a significant humor quotient which helps to balance out the way big boredom.
The most disturbing thing about Ghost Adventures is that shows like this tend to fuel the magical thinking beliefs of people who posses limited critical thinking skills. Many of the positive reviews of this show seem to support that assertion. In and of itself, I don't really care if people believe in ghosts; the problem is, when people believe true that for which there is no evidence, that belief can effect how that person understands other facets of reality. E.g. If a person believes he knows the will of "The one true God," and based on that belief in god's will, he judges some group of non-believers to be evil (non-believer being any people who do not share his particular belief of god's will), and if he also believes the one true god rewards his servants who kill evil people in his name, that person might be willing to kill many people who "offend" his concept of god. I admit that is an extreme example, but it's an example that has happened time and time again throughout recorded history, and still happens way too often for my liking.
I have no expectation that my words here will change the mind of any ghost or magic true believers who like this show. If on the other hand a reader is curious about how we humans come to believe many of the things we do, one might want to consider doing an Internet search for Michael Shermer. He has written several good books which explain our current scientific knowledge of the human mind's inner workings. He writes his books in such a way that those without significant scientific education can still readily understand the subject matter. One of his more recent books is "The Believing Brain" which can be found online and at many traditional book stores. It's a very interesting read, but I will warn you that after reading it, you might be inclined to reconsider some of you long and deeply held beliefs. Even if it doesn't cause you to reconsider your old beliefs, it might still help you in selecting which future beliefs you come to hold.
I do not sell books, and I do not make money from the sale of any book on the market today. I have, however, just finished reading "The Believing Brain" and thought the book applies well to this subject.