When comparing Mark of the Old Ones vs Legend of Grimrock, the Slant community recommends Legend of Grimrock for most people. In the question“What are the best games on Linux?” Legend of Grimrock is ranked 92nd while Mark of the Old Ones is ranked 125th. The most important reason people chose Legend of Grimrock is:
Much like tradition dungeon crawlers the combat is tile based where in each move is one tile at a time, just as an enemies. This makes for a good way to plan ahead of time by counting how many moves it takes to get to certain point or how many hits to kill an enemy.
Specs
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Pros
Pro Unique, inverse kinematics-based control scheme that allows rarely seen freedom of control
By utilizing an inverse kinematics-based control scheme there is zero need for pre rendered animations for the character. It is animated real time.
Pro Immersive, HP Lovecraft-inspired aesthetic
Mark of the Old Ones has a HP Lovecraft inspired aesthetics and graphics with the protagonist being a tendril laden creature who traverse landscapes that look fitting for any lovecraftian themed title.
Pro Free of restrictive DRM
Without having DRM loaded into the game users can not only play the game without an internet connection but also play it on as many of their compatible devices as they like. On top of this it can also be shared with friends, just as one would have back before DRM existed.
Pro Tile based combat
Much like tradition dungeon crawlers the combat is tile based where in each move is one tile at a time, just as an enemies. This makes for a good way to plan ahead of time by counting how many moves it takes to get to certain point or how many hits to kill an enemy.
Pro Lots of interesting and varied puzzles
There are many elements in game that require much puzzle solving through the use of hidden switches, locked doors, etc.
Cons
Con Limited architecture support
Mark of the Old Ones has no plans to create or support a 32bit version of the game which will limited people who are still using older 32bit systems.
Con Enemy AI can be easily exploited
Basically it is easier to run up to enemies hit them and then run away waiting for the cool down to expire than planning out tactics for each enemy.