Hybrids are definitally useful for honor. Even KD's warring for land have often had 2-3 support hybrid provinces. They aren't as good right now simply because there isn't that many great hybrid options atm. Human jumps to mind as a potentially good hybrid race running 3.5-4 TPA and thieves dens. But would you rather have another 20 OPA and run 2 tpa? Probably...
The biggest issue for hybrids atm is that the only race with +effectivness is fae ^_^