Who’s bright idea was it to put two mantis on the map Crossbow??? I get it it’s big team battle but did they ever think umm what would happen if one team got both mantis and sat at there spawn…??? Well being its the first time I’ve ever seen this map and I don’t really play btb all that much I had no idea where the mantis spawn or anything else for that matter but about 1:30 seconds into the game they had both mantis two ghost and a warthog all sitting at our spawns. It was a slaughter I literally couldn’t take 3 steps or even fire my gun to try and fight back. Before I knew it the score was something like 43-16 and was just getting worse and worse. Plus at this point and before my teammates started quitting and that didn’t help the situation out to much. So when I had died by the mantis rockets or machine gun for the like 8th time in the row without being able to fire a shot. I check a see how many are left out of 8 and there were only 4 of us wait… Another quit so 3 of us left now and the score is 60something or 70something to 20something. Spawn hit LB TO JUMP (4 NO REASON) AND BEFORE MY FEET HIT THE GROUND MY SPARTAN HAS TAKEN 30+BULLETS 4 ROCKETS 8 PLASMA SHOTS FROM A GHOST AND JUST AS MY BODY IS INCHES AWAY FROM THE COLD FLOOR… WACKKKKKK THAT SAME GHOST HAS NOW TOPPED IT ALL OFF BY SLAMMING INTO MY DEAD BODY SENDING IT FLYING LIKE A RAGDOLL 50 YARDS TO GOD KNOWS WHERE. SO at this point I down and I also quit the first game in Halo that honestly
That usually happens when it’s a team balancing issue and it didn’t help that you were playing against a party. It could be also be a weapons on the map issue so you should leave your constructive feedback about it in this thread.
I had the same experience as OP. Crossbow has a lot of wide lanes for the Mantis to traverse which basically makes the rockets a useless counter. Railgun could work if you empty every round that it holds into the Mantis, but even then you are SOL for the second one they have.
This leaves the plasma pistol as the only counter and, again because of the wide lanes, you would need at least 2 or 3 other people to rush it as it is being stunned because you will be getting picked off due to the abundance of DMRs and lack of cover within the lane.
You could argue the Kinetic BR could do some damage but that is really only a viable option when you party up with teammates and you coordinate a teamshot.
They should seriously consider changing the rockets to a laser so an individual might have a chance to impact the game.
Don’t even get me started on the matchmaking logic in this playlist, especially if they plan to keep it the same when it goes ranked.
Btb often has those problems, once I met a 12 men-team.
And yes 8 in Red, and 4 in My team. That time we lost in 2.37 minutes. 
If you have any constructive feedback to offer, feel free to use the dedicated feedback thread
https://www.halowaypoint.com/en-us/forums/58b8518e005f432381ab99fbcaf931e0/topics/big-team-battle-refresh-feedback/90a6d9b0-fbac-4ab8-aa95-eb7c50d36ac9/posts