The Spike Rush is what you'll play if you just wanna play a bit without spending a lot of time on a single match. The average is I think 10-15 minutes for each match. A team only needs 4 wins to win the match. What's exciting here is that the weapons are randomized. You can't buy anything. Sometimes the ultimate ability is charged as well even at the start of the match.
There are also random orbs that you can pick up that can cause a specific uhhh thing to your teammates or enemies. Like once you pick up an orb, it can inflict paranoia to your enemies, or it can heal all your teammates. Or you can get a specific gun, etc.
It's just fun and quick lol.