"It beats 90% of unit types and requires very narrow counters, often from different factories" is pretty much
the definition of OP in ZK.
The worst part is not that it's OP, however. It's that the non-strider mobiles that actually manage to counter it (Buoy, Wolverine, Firewalker, ...) are
also all skirmishers, often of that specific kind that has a raider-killing sidearm.
That, and porc.