Thread of randoms in every game mode:

Gem Grab: They collect all the gems and never fall back to their spawn because 1 extra gem won't hurt.
Tip: You're going to have to be gem carrier, the aggressor, and make the comeback when needed to.

Solo Showdown: They team or camp and best I'm this game mode because at least they don't weigh you down
Tip: don't play at 700+ trophy range unless you're a teamer

Duo Showdown: They take your power cubes if you die, they never wait for you to spawn. They're way too aggressive and end up realizing way too late and end up bringing in multiple teams to take you both down.
Tip: best game mode to push with randoms because you can easily carry

Brawl Ball: Mortis Mortis Mortis Mortis Mortis Mortis Mortis Mortis Mortis Mortis Mortis Mortis Mortis. Own goals, failed trick shot, horrible picks aside from mortis such as piper that lack dps to defend. Never passing the ball, passing the ball when your fighting an enemy.....

...always waste their supers to try and score a long shot, always blame one another after conceding a goal, auto aim an own goal accidentally or pass to enemy with auto aim accidentally.
Tip: May as well quit if you have a mortis on your team

Bounty: Tip: you have no choice but to play aggressive until the end as your teammates will always suicide in search of kills

Heist: Oh no! Theres a Nita attacking our safe and I'm a bull. I have to defend against her. Oh no I died and fed her super and we lost. Tanks and high damage dealers for attacking? No, they're to defend and feed enemy supers. Horrible Gale Jump pad placement. Surprisingly....

...Unsurprisingly, Mortis.
Tip: Forget defending against spawners if they dont have their supers. Never underestimate a colt, spike, and brock with incendiary

Seige: you are fucked
Tip: don't play this with randoms. Seige is heavily based on control, something randoms never understand

Hot zone: idk hardly play
Tip: its heavily reliant on staying alive, don't die too often

Let me know if I missed anything or something you would add

I forgot a super important one. Afk teammates every single time