With Vengeance you can choose the original route. As in the original game.
Or you can choose the new route that goes in a completely different direction. Fixes the story (as in, actually adding a deep story), pacing, new area, ect. Basically what the game should have been if they didn't run out of time.
The director outright states he pushed for this new version because he wasn't satified with the original
The endless battle between the High Heavens and the Burning Hells rages on as chaos threatens to consume Sanctuary. With ceaseless demons to slaughter, countless Abilities to master, nightmarish Dungeons, and Legendary loot, this vast, open world brings the promise of adventure and devastation. Survive and conquer darkness – or succumb to the shadows.
Classes HEROES OF SANCTUARY
Create and customize your character to battle onward against the unspeakable horrors that blight this land. Choose from one of five classes, discover and experiment with a vast array of powerful equipment, and carefully select your talents and abilities to become steadfast in the face of darkness. But choose wisely; your world depends on it.
The Barbarian has unparalleled strength and expertly wields an entire arsenal in battle, with a weapon for every occasion. He bellows intimidating war cries and unleashes ground-shaking slams to send approaching hordes reeling.
The Druid is a savage shapeshifter, fluidly transforming between the forms of a towering bear or a vicious werewolf to fight alongside the creatures of the wild. He also commands the power of earth, wind, and storm, unleashing nature’s wrath to devastating effect.
Necromancers are cunning summoners that conjure vengeful hordes of the undead. Their Essence flows into three powerful bastions of Bone, Blood, or Shadow to bring low their enemies.
The Rogue is an adaptable, agile warrior who can specialize in ranged or close quarters combat. She can best any foe with her imbued weapons, perform powerful combo attacks, and can augment her arsenal with deadly poisons and shadow magic to slay demons with impunity.
The Sorceress shapes the elements into whatever form is necessary to ensure victory, from hurling bolts of lightning, impaling her foes upon jagged spikes of ice, and raining flaming meteors down from the sky.
Explore Sanctuary – Discover the world of Sanctuary as you battle through its expansive lands. Join fellow adventurers, retake besieged towns, delve into corrupted dungeons, and uncover lost secrets as you fight for the fate of the world.
Heroic adventurers can clear out Strongholds such as this one, claiming them once again for the citizens of Sanctuary. The town will never be the same, but victory here can leave a lasting mark and transform this hostile region into a safe haven.
Battles take a turn when you enter PvP zones. Mark yourself as “hostile” and these high-risk, high-reward areas of Sanctuary allow you to take a swing at other players for their valuable loot. But be warned. This also opens you up to being swung at.
MEET YOUR MAKER
Lilith has returned to Sanctuary, summoned by a dark ritual after eons in exile. Her return ushers in an age of darkness and misery.
LEGENDS OF CREATION
An old legend has it that Sanctuary was created by the union of an angel and a demon, and that their descendants—humanity—built villages, then cities and empires, spreading across the land to form the world's cultures and civilization.
A REIGN OF ENMITY
Chaos threatens to consume Sanctuary as evil and impiety continue to spread. Depraved demons and corrupted wildlife roam the land unchecked, as terrified townsfolk huddle in dark corners trying to survive one more day.
CULT OF PERSONALITY
The pious plead for guidance from their faith, but doubts have them feeling that their devotion is misplaced. Lilith's return has spawned a new wave of cultists and worshippers, but regardless of dogma, all prayers remain unanswered.
DAUGHTER OF HATRED
The daughter of Mephisto awakens burning urges in the hearts of those around her, be it demon, human or beast. Profound fears, unchecked rage, repressed impulses, sinful desires—all are brought forth violently and irresistibly by her mere presence.
As darkness returns to Sanctuary, a brave few dare to face this threat. But what fate awaits them in a land forsaken by hope, valor, wisdom, and justice?