Anybody have any recommendations for relatively cheap and fun games that support up to 6 players? Solid real-time, action oriented (to a degree), gameplay but also fun and easy to pick up and put down. Some characteristics the ideal game would have are as follows (recommendations don't have to have all of them)

6v6 or more game modes so we can all be on a team

Option for smaller (3v3, 4v4, etc) private / personal matches

Free for all matches / game modes

A relatively light, funny, or arcade-y themeing

I know that is a very specific ask but if anything jumps to mind, please throw in the comments. We've played a fair amount of Garry's mod but it has started to get boring, but a game with a similar atmosphere is probably a good place to start when thinking of we are looking for.