When comparing AssaultCube vs OpenRA, the Slant community recommends OpenRA for most people. In the question“What are the best open-source games?” OpenRA is ranked 19th while AssaultCube is ranked 24th. The most important reason people chose OpenRA is:
Classic Command and Conquer with overhauled UI, rebalanced gameplay, replays and observer mode.
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Pros
Pro Minimal resource usage
AssaultCube is extremely fast, small, and network efficient for an FPS game.
Pro Cross platform support
AssaultCube runs on Windows, Mac, and Linux.
Pro Fast-paced multiplayer FPS gameplay
AssaultCube does a good job of adding fun, fast paced shooter gameplay (like in Counter Strike) to the open source world.
Pro Activity in multipayer
Many people online. You can play it every time you wish.
Pro In-game level editor with support for realtime multiplayer editing
Admins of a server can enter edit mode for a map during gameplay, updating components of the map live without needing to run other software or develop any code or image assets.
Pro Variety of fun game modes
Pro Has a decent number of community servers
Pro Modern improved recreation of the classic game
Classic Command and Conquer with overhauled UI, rebalanced gameplay, replays and observer mode.
Pro Fosters creativity
Features an in-game map editor and is geared towards modding.
Cons
Con Few weapons
Few weapons. Really. One assault weapon, one pistol, one sniper rifle and one shotgun. Boring.
Con Lack of gameplay refinement
AssaultCube does not have that many weapons (though they do have some variety). Additionally, the game is not very balanced, as spawn points are sometimes in vision of other enemy spawn points.
Con Outdated graphics
Based off the original Cube engine, which has dated quite a bit.
Con In a grey zone
(The C&C guys are actually well aware of this project and are fine with it... so this isn't true.)
All CnC assets are still copyrighted by Westwood/EA and not freely available anymore, so per law, it is illegal to share them as mods. Also, Dune was never available as free download, which makes the whole mod illegal as well.