I wasn't expecting Major Mayhem to be anything good, since from all I know, it was a shooter designed for mobile devices with touch screen. Turns out I was wrong, Major Mayhem handles pretty great with your mouse, which you use to aim, shoot and activate several powerups.
Overall Major Mayhem presents you with a pretty simple, if not poor, storyline and some really neat looking graphics. The game is pretty much a simple aim and shoot game and you ocasionally take cover. By killing enemies and getting higher combos you get more points and more coins, which you can then spend on clothes and unlock weapons. The soundtrack was actually pretty great to listen to while playing. The enemy variety is rather lacking and the same goes for bosses.
In the end Major Mayhem will end up being enough for some people and not enough for others, it certainly is nothing to be amazed by but it can provide you a few hours of fun with the various modes it has (Campaign, Arcade, Time Bomb and Survival).