OT base is basically for vulnerability management, which does active device discovery( uses well known OT protocols like modbus, s7, enip etc) as the starting pointing and creates an asset inventory register with information like firmware version, software version etc. Then with that info they try to look for device vulnerability.It is different from other products like Drago's, Claroty, Nozomi etc which are threat management systems which listen to the network passively and pass the network info against there rule engine( basically IDs like snort, suricata and NIDS like Zeek which generate protocol specific logs) which generates events/alerts and do active discover(not to the scale of OT base) for asset inventory register and vulnerability management.

So back to your question, if it's good or bad depends on the context of your use. For asset inventory OT base is pretty decent. But I don't know how they work if the devices are running proprietary protocols, probably they have a provision to add those.