When comparing Open d6 vs Marvel Super Heroes, the Slant community recommends Marvel Super Heroes for most people. In the question“What are the best tabletop RPGs?” Marvel Super Heroes is ranked 14th while Open d6 is ranked 22nd. The most important reason people chose Marvel Super Heroes is:
MSH has a quick and easy character generation process. Characters are created by rolling for origin, ability scores, powers, talents and deciding on a name. It usually takes less than 10 minutes and offers an impressive variety in characters created.
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Pros
Pro Includes rulebooks covering the more common genres
Open d6 includes rulebooks for Fantasy, Adventure and Space settings.
Pro No special dice required
The game can be played with common six-sided dice.
Pro A simplified variant, called Mini Six, is available
Mini Six is a fan-made variant of Open d6 that aims to be a distilled version of the Open d6 system.
Pro There are theme-related books available to start various types of games
D6 Space is West End Games old "Star Wars D6" game with all of the licensed Star Wars names removed. It's a stand alone complete game.
D6 Fantasy is a standalone ruleset for running a D&D type game with the D6 system.
D6 Adventure is a standalone ruleset for using the D6 system in a Wild West, spies, or modern adventure game.
All three have supplement books (Spaceship design, magic, aliens, etc).
Pro Each rulebook has a good introductory section
Pro Random character generation is quick and allows for some truly memorable superheroes
MSH has a quick and easy character generation process. Characters are created by rolling for origin, ability scores, powers, talents and deciding on a name. It usually takes less than 10 minutes and offers an impressive variety in characters created.
Pro Designed to be beginner-friendly and narrative-focused
The game has a light ruleset that encourages roleplaying. Most conflicts are resolved with a percentage roll and a consulting table with the GM having a lot of flexibility due to rules being mostly just guidelines.
Pro Character advancement is optional
Pro Power Stunt mechanic encourages creative use of powers or abilities
(not available in the basic set)
Pro Karma system rewards heroic roleplaying
Karma is a resource used for character advancement and increasing chances in a conflict. It's gained by performing actions that a moral hero would perform.
Cons
Con Complicated magic system
Con High level of randomness
Power balance between characters can be highly varied since all attributes are decided with a dice roll.
Con Designed with a single interpretation of a superhero in mind
MSH's karma system rewards ethical behaviour, as such anti-heroes like Deadpool or Punisher are almost impossible to play as.
Con Some of the karma system potential is lost
Karam system is used for 2 things in the game - advancing the character (getting new powers, abilities and raising ability scores) and improving character's rolls. Since most players tend to focus on advancing the character, the secondary function of the karma system is often wasted potential.