As first line infantry/meatshield yes. Gbetos and shotels are raiding/blitzkrieg units, and karambits are a swarm unit, but all those units have poor stats (with the exception of speed and atk) and they due to most units.
Berserkers instead are also tanky, both in melee and pierce, so I see them more similar to eagles or champs, depending of the need and context.
Lithuanians halbs maybe was a poor comparison, you are right, but they can be used in front of range unis as a meatshield, like berserkers can…