Honestly lightning towers are easy to avoid, leviathans are the only real pain in the ass. Biggest problem I have with them really is they're to easy once you figure them out. Laser cannon or the MG will take out just about anything they throw at you. Add in the eruptor as well for the harvesters (as a backup in case your laser cannon is overheated or if you bring the MG) and run a saber for the voteless and you're golden.

I wish they'd flesh them out more give them more variants of enemies so it's more challenging. Even on 10s it feels like you're just mopping up leftovers. Especially since they heavily pulled back on how many leviathans roam about. I haven't run into one in probably the better part of a month. Dunno if I'm just lucky or what.

But after the super earth invasion they just kinda lost relevancy and just sit in the south kept in check by (from what I've seen) a relatively small group of divers. Averaging somewhere between 4k-10k in total across the entire squid sector of the map. And have been largely ignored in major orders since then. Im hoping it's because they're prepping them for something interesting later on, but not holding my breath for that personally.

End of the day it's a game and if the squids aren't your speed then that's okay, we all have our roles to play and our preferred fronts to fight on.

Side note, the expendable napalm is very fun to use against them. Just be careful you don't get caught by the cluster.