What are some alternatives?
When comparing Batman: Arkham Asylum and Grim Dawn, you can also consider the following products
Assassin’s Creed - Assassin’s Creed is a best long running and extremely popular series of open world video games which mixture of action, adventure and more importantly stealth into a single experience.
Titan Quest - Titan Quest Anniversary Edition Titan Quest is back! Nordic Games (now: THQ Nordic) acquired Titan Quest in 2013 from THQ and started to work on bringing back the multiplayer and improving the game further.
The Saboteur - The Saboteur mixes in the regular setting that many open world action adventures travel to simply by using a World War II theme instead.
DARK SOULS III - Dark Souls III is an action-RPG known for its difficult gameplay. You play as an Unkindled undead, trying to bring back the Lords of Cinder.
Far Cry 4 - Action and also adventure hit fresh heights in Far Cry 4, a game which supports to the open world shooter techniques produced from previous additions in the franchise very closely.
Path of Exile - Path of Exile is a free to play online action roleplaying game that draws clear inspiration from Diablo but charts a path all its own.