Dreamscarred Press Announces: Path of War Expanded

[Prime32]

I think it's fine. It's more or less the same as the organizations from 3.5 and organizations scaled as you leveled up. Yet, you hardly ever see them around, since it's from an obscure source.

Nah, affiliations were in a few places, and the Knowledge Affiliation from Complete Champion at least is pretty well known for its ability that lets you turn off enemies' powers. The issue is most of their requirements are things like "attend meetings at HQ every week" or "perform a lengthy quest for your superiors". Basically you can't use them unless the DM writes a campaign centred around them. If the game was initiated by the DM then he almost certainly has a pre-existing concept that it will be hard to integrate them into, but the affiliation mechanics aren't interesting enough that many players would specifically ask for a game that uses them.

EDIT: There's also the issue that few affiliations will benefit all members of the party equally, but giving each party member a different affiliation increases the difficulty in working everything into the story, and can make it hard to justify why the PCs are even working together.