With any job the devil is in the details, or to put it another way it is easier said then done. There is a human tendency to assume that what we see up front constitutes the same in the back. This is actually a logical deduction that tends towards being correct. What you see is usually what you get. Were that not the case life would be truly terrifying. That said the rule almost never applies to employment. Every job is more complex then it looks, and you really need to develop a lot of skills to succeed. That is what people talk about when they say secrets to the trade.
On a purely literary level game journalists are paid to be short, concise, and balanced. They must lay out the high points, low points, features, and opinion. All within a short period of time under a deadline. Polish and length while not contrary to reviewing are not the crux of the challenge. They have a handful of minutes to giver to fully inform the reader or viewer. While still being entertaining. That is a difficult talent to come by naturally, and takes a good amount of time to perfect. I am a concise writer, and I can tell you it can take hours to keep it short, simple, and rewarding.
Their task is not to play games. They are paid to dissect games, and the faster they do it the better. You could say the difference is like the one that exists between making love and whoring. One is a pleasure, and the other is going through the motions. A good reviewer should be able to burn through a game. This actually takes a special mindset. You can develop it, but if it doesn't come naturally to you it is going to be incredibly tedious. They do not play the games linearly, or in a organic fashion. They stab the games to get the most information possible in the least amount of time.
Honestly I would say about three percent of posters would qualify on the writing level of the equation. That being decent writing, decent research, and good logic skills. The sad truth is the vast majority of posters on this site are lacking in basic journalistic skills. When they post a link nine times out of ten someone else has done the actual work. After that you would probably lose about half that number on the technical side. Sitting in a chair playing a utterly crappy game for four hours at a stretch just plain isn't fun. Cramped bodies, carpal tunnel, the lack of real meaningful social interaction. With that you need a mind that can entertain itself. Otherwise you likely to go just plain nuts after a couple months.
I am saying you would find a few here or in most gaming forums. More in one forum, and a few in the other. The thing is it probably isn't that great of a job. Sure it probably isn't back braking labor, or a high stress environment. It is just probably a lot of mind numbing boredom. That probably ruins most of the fun in gaming.