Warhammer 40,000: Space Marine Preview

Since we don't really know if Space Marine continues to follow the original action RPG path it was intended for, I'll point you over to Player Affinity for the latest preview.
It is generally accepted that against most foes, a Space Marine can easily win in a one on one fight. So as to keep an element of challenge in play it looks like Relic will be throwing armies of Orks and other classic Warhammer foes such as the demonic forces of Chaos which also look to be playing a role in the games story. The story of Space Marine follows Captain Titus, a soldier of the Ultramarines chapter who is leading a force of fellow Space Marines and Imperial Guard in order to defend a Imperial Forgeworld from an Ork invasion. As is generally the case with almost any Warhammer 40K story, The Forces of Chaos will also be involved in the game and provide you with a far more devious foe than the Orks who will attempt to overwhelm you with sheer numbers.