Summary: I picked this game up on Steam when it was for sale at $2.79. I bought it not expecting much. What I discovered was a incredibly fun that is surprisingly tactical in nature. I found myself replaying level after level trying to improve my strategy to get a better score.
Summary: Orcs Must Die is a Tower Defense/Third person shooter hybrid whereby you control a "War-mage" that has to stop his realm from being overrun by Orcs, Ogres and other types of fantasy-creatures that make their way to the "Rift". Once enough Orcs make it into the rift, the player loses the game.
Summary: Orcs Must Die! is an surprisingly fun and satisfying tower defense/action hybrid based around slaughtering hoards of Orcs in some very creative ways. Open pools of acid? Launch them in with a Spring Trap. Low hanging ceiling? Smash them to bits with a Pounder.
Summary: Orcs Must Die! is a fun diversion. They've combined FPS with tower-defense. The traps are fun to place and watch, and being in on the action takes away a lot of the tedium that eventually sets in with most TD games.
Summary: Orcs must die takes on a different style of tower defense. Instead of the usual "God" overview where you can place towers wherever you want, OMD is more of a mixture between a third person shooter and a tower defense.
Summary: Great graphics, its like a first person Torchlight, great sound, good options for configuring. Y invert, awesome mouse sensitivity settings. I'm about 5-6 hrs into the game so far. This is not your typical tower defense game where you are "safe" each wave.