Changelings are a bit oddly restricted, not being able to do a "generic" or custom face is quite a departure from how they used to be.
Shifters are interesting, although I have to wonder how well they interact with bonus action scarcity, and that Wildhunt bonus on wisdom saves stands out because all of the other changes are physical rather than mental ones (even if normal lycanthropes do have mental changes it raises many questions).
Warforged have been evened out a bit, no healing weirdness, and they have to "trance" now. Speeds up combat, slows down downtime activities.
And I just noticed there are no age rules. They are mostly fluff, but it's important fluff and it only takes a sentence or two and minimum time to transpose.
The artificer is what disappoints me though. Not just the lack of mechanical skills. But I would have liked to see elemental damage, resistances, special movement types, and other infusion powers rather than simple +1 or +2 bonuses.
I expected Dragonmarks to be a background. Just so that everyone could get in on them at first level. I suppose feats are more akin to their real power though.