Howdy,
Was 'Only War' really necessary? I had thought that originally this was a DH supp for the Imperial Guard. Do we really need a whole GAME devoted to the IG?
YES, there is a lot of potential for roleplaying and action. However, you can already play Guard characters and there are facets of the Imperium's military that are fleshed out enough to make gaming in this niche possible.
How about an Eldar core game? There are 8-10 supps that you can derive EASILY from this (Craftworlds, Maiden Worlds, Aspects, Warlocks, pirates, Dark Eldar, adventures, etc), and as of now the Eldar are not playable as PCs. Over the years I have heard a LOT of interest at the cons and on the boards for Eldar (and other Xenos), but never the Guard....
Missed opportunity, IMHO.
Ken