Penumbra series, underrated and overlooked ?

[zoroztheg4mer]

To me it seems like Penumbra is terribly overlooked and underrated, who would agree with this, and please tell me why you think this is.

It wasn't published or marketed by a major firm like Activision or Electronic Arts. In fact, I hadn't heard of it until Black Plague came out, and it was only on a small comment on a website about a patch being released. If it wasn't for a demo, I would have never looked into it and bought it.

Would you agree on it being underrated ?