If the last 23 years have taught us anything, it's that it may be impossible to make a good film based on a video game. Every attempt to date has resulted in failure, without exception - even the somehow-long-running Resident Evil film franchise is nothing more than a series of duds, and they may actually be the closest we've got to "tolerable". It's impossible to say why this might be the case - you'd think the law of averages alone would have given us something decent by now - but the fact is that we're yet to see a good film that is based on a video game, and Warcraft: The Beginning doesn't manage to change that.
Opening up on the home world of the orcs, Warcraft: The Beginning initially follows Durotan, an orc war chief, as he and his people invade the kingdom of Azeroth using a magic called the Fel in order to escape their own dying world. From that point on we swap between Durotan and Anduin Lothar, a human military commander, as the war between orcs and humans is waged, which slowly sees Durotan begin to turn against his own people thanks to the way that the Fel (controlled by an orc named Gul'dan) has corrupted them.