I admit, I had a d'oh moment when I read what follows, feeling a little dumb. I really didn't treat these mobs the way I should have the other night, which was truly giving consideration to the abilities they posess.
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Most of this trash is immune to CC, so, try your best and use your CDs (you can just sit there and wait a couple minutes for Bloodlust recharge before facing Beth...)
Kill spiders first (Spiderlings, Drone and the last one, in this order), AoE as hell and try to keep them away from the three big guys. Meanwhile we sent OffTank, Healer and Rogue to interrupt Cauterizer.
As soon as the spiders are down, DPS cauterizer.
Watch out for the two other guys, they throw spears at random targets that hit like trucks, so you might wanna use some defensive CDs/Auras.
We downed them pretty easily with this strategy.
Basically, the spiderlings need to be killed by ranged AoE asap because anyone near them gets spit with venom and to prevent the spiderlings from being eaten by the drone. The Drone needs to be taken away from the spiderlings best it can by a tank while it gets DPSd down asap so it doesn't eat the spiders and get buffed and healed by them.
The other tank with a dedicated healer has to go to the cauterizer and interrupt him any way he can. And then we basically just have to deal with the nuisance of raid damage from the spears until we can handle them.
We'll be giving it another try soon enough.