Toph continues to be the same old awesome Toph we know and love her parts ere hands-down the best pars of the episode, although the Eska scene was fun too. Asami was conspicuously absent from the episode, tho, but there wasn't much for her to have done anyway so w/e.
Kuvira is railing against hereditary leaders only (i.e. she should have no problem with Raiko). She's saying that the leaders should be leaders because of their abilities and accomplishments, not just because they're related to the preceding leaders. And she does have a point: if she wasn't so villainously ruthless (and now dipping into evil spirit voodoo science or whatever the glowing root's all about), it'd be easy to agree that she'd be a much better leader for the Earth "Kingdom" than Wu. Granted, he'd have advisers or whatever pulling the real strings for him, but that makes you wonder why a figurehead king would be necessary at all: at best it's a waste of money, at worst it's an invitation for another Dai Lee situation.