The way I'm seeing it, isn't in the individual nature of the Fused, but in the cumulative effect that their resurrection with the Everstorm is going to have on the Radiants. Odium has hundreds of Fused, with more waiting to find hosts (which doesn't make much sense to me since some of the other Fused have been shown to have had multiple bodies already). Odium when he decides to infuse the Everstorm further, can come pretty much whenever he wants it, bring forth more Fused.
Even with their powers, there aren't many Radiants right now to be able to stand against them. Radiants will wear themselves out defending against overwhelming numbers. Which isn't really related to their power level, but was part of my thought on why I thought of them as overpowered.
And do we know for sure that Dalinar can do that at will? I know there was a line about superpowering Kaladin, but can we say that he can infinitely recharge gems? That's something I kind of expected Radiants would have to have else how could they fight during the Weeping, but haven't really seen yet.
As for the Unmade and their effects, good call. Forgot about those.