It's easy these days to get excited about video game stocks. But investors should beware: Not everything is what it seems.

Part of the recent enthusiasm around video game stocks comes from game maker Activision's (ATVI) announcement on Thursday that it was raising its guidance for its Q1 results, which will be released on May 6. The company expects earnings of 72 cents per share, up from its earlier forecast of 70 cents per share. Shares were up nearly 4% on the news and the stock is up about 19% for the year.

Nintendo is also the source of some intrigue as it pushes ahead with ambitious plans to bring video games to the classroom and to implement 3D video game technology. Plus, the company is rolling out a souped-up DSi video game console with a bigger screen.

Believe me, I am no Guitar Hero fanboy (although I do own the game), but as a 30-something male who would listen to Metallica's Black CD repeatedly before playing in a college football game, even I am excited about the latest offering from Activision Blizzard (NASDAQ: ATVI).

Seriously, what heavy metal fan isn't drooling at the chance of playing air guitar to some of the greatest Metallica songs of all time? But before I get too far ahead of myself, the news is that the play list for the game has been released (I found the list through RollingStone.com).

Yes, there are some dogs on the list (I'm not a big fan of The Unforgiven or One - it's just too long); but the chance to play my Guitar Hero axe to Seek and Destroy and Sad But True is enough to make me shell out the cash when the game is available for the PlayStation 2.

No, you're not surprised. Nintendo (OTC: NTDOY) moved the most video-game consoles in the U.S. in July. According to this Bloomberg article, which cites monthly data supplied by market-research firm NPD, gamers purchased over 550,000 Wii systems. Sony's (NYSE: SNE) PlayStation 3 was snapped up by almost 225,000 players, and Microsoft's (NASDAQ: MSFT) Xbox 360 sold about 205,000 units.

There's no question about it now -- the Wii should dominate the holiday season. Momentum is behind the company's strategy of creating products that appeal to casual gamers. I'd be shocked if the fad all of a sudden burned itself out, although Douglas McIntyre did write recently about the possibility of Nintendo running out of steam at some point. The Wii Fit exercise system was the second best-selling software title in July. That property is definitely helping drive Nintendo's fortunes.

In other software statistics, Electronic Arts (NASDAQ: ERTS) was number one with NCAA Football '09. Activision Blizzard (NASDAQ: ATVI) came in third with its version of Guitar Hero for the Nintendo DS handheld unit. EA should come out on top again next month since the new iteration of its Madden franchise came out earlier this week. There was a lot of excitement over that game, as there traditionally is every summer.