Update 2: Completed the mission like 5 times, each time with randoms. It is actually one of the easiest maps to beat. I tell you why. You are provided with lots of new weapons,tactical items like sticky flares and traps that can turn rhinos friendly. Seeder can be easily dealt with.
Here is the strategy in short. Engineer i s optional. It is better to have at least 2 medics, a tank and a weapons specialist. All upgraded with armory. Weapons specialist takes down seeders right away. Engineer can take down the sprouts from seeders as they are weak. Sentry's are a no-no too much open spaces and lots of cryptids. Go with either an IMS or quadrator. Make sure you have at least 2 guys with armor and one guy with boosters. Armor is the key. Prepare to lose a lot of health when you battle kracken. But before that I will tell you that don't go crazy on crafting items or boxes. Save them until you get the venom schematics. This way all 4 players have parts available quickly. All 4 venoms are good. Only thing you need to remember is ONLY refill venom ammo when you use 4 out of 6. Because the Venom drop generally carries 4 shots. For kracken don't panic and go easy when it is not red. Kill the cryptids and get prepared. Once it turns red, get to the turret and start shooting. Make sure you drop multiple armors. And save your money for armor. Shields are very useful although not must. I would not vote for Ferrel either. My favorite guns are Mtar (no reload needed, big clip) LSAT (big ass clip but takes forever to reload without team boosters but perfect to kill seeders and their sprouts in one clip) and finally the upgraded sniper (another great gun for seeders). Shotguns are also good, but only when you are a weapons specialist. The upgraded Medic and other classes are great. Simply double tap up on your d-pad to activate it and it will automatically revive any downed players in your 5 feet radius. It stays for 8 seconds. Another good buy for armory is protection from seeKers. I can't stress you how many times I died because I was focused on seeDers and rhinos and a group of seeKers just surprised me. It is cheap and only costs 5 points. Most randoms I find for this map are decent and have mics. Just tell them what to do and they will listen to you. I.e. not opening any tool boxes for parts. Everything else if pretty easy. Just remember the class setups, medics and weapon specialists are way to go. I don't have much time to break this down into paragraphs so pardon me. If this hurts someone's eyes I may break it down later. But I think it is a decent read for those that are pursuing to beat the kracken.
Adios.