From my own personal experience, there are only two magazine on the market worth buying. They both give well informed opinions about the gaming industry, and don't end up falling for all the souped up hype that most magazines have a habit of generating just to sell a few extra copies.
Edge
GamesTM
For those not in the know, I'll describe both below.
EDGE tends to take a more feature led approach. It focused very heavily on what goes from inside the industry, concentrating on the companies and people that help keep it running. It's review and preview sections are pretty top class, but they tend to review only the most important games (You won't see reviews of thrash like Leisure Suit Larry or stuff like that), so they don't review every game that is released. To a casual viewer, those sections might seem quite small, but they make up for it by being of an infinately better quality than probably any magazine out there. Unfortunately, the magazine does have a somewhat cynical outview of the industry. While it might oft times be justified, it can get on your nerves sometimes.
GamesTM, as it's name implies, focuses more on the games themselves. It's review and preview sections are larger, but they definately don't sacrifice quality for quantity. There are less features than in EDGE though. It tends to be less cynical than EDGE as well, and the magazine has a consistent humour and wit throughout that makes it fun to read. It's also boasted by having a dedicated (about 40 pages) retro section.
----------------
If you actually want an unbiased opinion on the industry, you would have to be idiot any single format or "official" magazine. The people who work on those magazines are usually arrogant fools who hype up anything to do with their machine, and end up being grossly misinformed too, half the time.
I wouldn't touch a gaming site with my bare hands.
