so, Erik Tenkar hates Rot Grubs.
Which is funny, because he's not opposed to sticking nests of giant centipedes in barricades, oh no.
I obviously use rot grubs, because I'm an evil GM.
Generally the thing about rot grubs is, they're a trap with a cure. Instead of rolling a resistance roll, and on a failure taking damage, you get attacked by burrowing grubs and either cure them (no damage), burn them out (take damage), or do nothing (and die.) It's just a trap with a different special effect. I can't get too upset about them. They're just a gross way to get attacked, like anything involved grubs, maggots, or flesh-eating worms (regular, or rotworms.) They're not more unfair that "save for half damage" types of attacks, where some nastiness occurs 100% of the time. In this case, it's just grub-based.
I'm fine with that.