When comparing Tales of Maj'Eyal vs Nethack, the Slant community recommends Tales of Maj'Eyal for most people. In the question“What are the best open-source games?” Tales of Maj'Eyal is ranked 25th while Nethack is ranked 29th.
Specs
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Pros
Pro A lot of depth through many character classes and quests
Pro Pretty polished compared to other open source games
Pro Easier to learn than some other roguelikes
The graphical menu system helps a lot.
Pro Built-in but optional chat system for bragging or when you get lost
Pro Potential for enormous skill growth
Nethack is a game that you can play for hundreds of hours and still not master. But you'll have tons of fun attempting to master it.
Pro Depth
The gameplay is very deep due to the amount of skills and systems present in the game.
Pro Over two decades of constant development
Nethack was first released in 1987. The latest version, 3.6.0, came out in December 2015.
Pro ASCII and tiles available
Nethack is able to run on simple ASCII graphics or use graphic tiles instead.
Cons
Con Bad balancing
Not all classes are balanced. Some are clearly weaker. As an example, every class that can summon, cannot avoid their summons to waste their skills. This is not important, except if you only have 1 summon, like the alchemist, that often charges you.
Con LUA bugs
It depends on LUA for many (if not most) things, this could ease the development, but in the end, the result is several crashes which are hard to debug.
Con Heavy resource need
Lots of graphics effects, which may make the game run slower on older systems.
Con Graphics may not appeal to everyone
Mostly because they are a mix of styles assembled throughout the lifetime of the project instead of one consistent whole.
Con Burden of knowledge
There's simply too much information that the game expects you to know before you can properly take advantage of the systems in the game.
Con Feature creep
NetHack has an overwhelming amount of features mostly because the development team found them cool at the time, but with little thought of their greater impact. For example, a Nethack staple is Sokoban as a built-in minigame, which feels out of place in a dungeon crawler.
The extremely large amount of items and abilities break the game's balance and coherence.
Con Outdated controls
You need to study a wiki just to learn the most basic controls. The game is broken in this regard.
Con ASCII Art
Con Run of the mill story
The story of the game is pretty generic fantasy fare. It features orcs, elves, and trolls in an effort for the hero to save the world. While it does not detract from the gameplay, it does seem very familiar to those interested in the genre.