I'm pretty sure you can't reduce attacks to 0 with grabba sticks (feel free to prove me wrong, as i'd love to be

) , but other than that, yeah

The grots have a lot of ablative wounds, and can reroll their morale by losing a few instead of being butchered by 'no retreat' wounds, and they are cheap
Tankbustas are awesome vs Nids. 15-rokkit volleys tend to make a dent in any
MC, even if only 1/3 wll hit
I've found Kommandos to be handy also. Some Nid players like to camp a unit, like Biovores, in a corner, behind cover, and Kommandos are good at unshucking them, or at least tying them up so that they can't fire. A
PK's Kommando Nob can make a dent in a rearline-camping Tfex, using his unit as ablatives (they'll die, but the T-fex will be busy for a bit

)
I've also found that Venomthropes aren't fond of Kanz, as their groovy poisons won't work, and the kanz can dice them fine in
CC.
Zoanthropes and pods can be a bit of a git, though, but if they are close enough to nuke you they're in dakka range