Goat Simulator is like an old school skating game, except instead of being a skater, you're a goat, and instead of doing tricks, you wreck stuff. It brings next-gen goat simulation to YOU. WASD to write history.
How often do you get disappointed by a game which promises you the moon, but doesn't deliver? Well - this is a game which gives you exactly what it promises: a goat simulator and nothing else. Any other additions to the game are merely icing on the cake. And, with the recent MMO addition, you get even more to, uh, simulate with your goat (or microwave, one of the RPG-style classes included).
But seriously, this is quite simply a fun game to do practically anything you want. Originally intended (or so we're told) as a practical method of allowing programmers to experiment with a new game engine, the company decided "what th' heck - let's just throw it out there" - and so was born the joke that became a serious hit.
Though slightly irritating at times, the humor of the game will have you totally forgetting any frustration you may be feeling. So, sit back, click start, and lick (literally) everything in sight.