But what about compared to the other playtest races, because that seems to be an issue for him too (that the human is weaker, specifically).
It's... a toss really. My tentative ranking based on how powers can be used in a campaign is this: (this is highly debatable of course):
Human being under Ardling, Dwarves if the campaign will ever venture underground for a significant part of it, elves, halflings and tieflings; on par with Dragonborn, gnomes, orcs. They'd be in the lower tier, but not far below.
This depends on how your campaign value darkvision, really. Humans are darkness-impaired. The big thing of getting feat compensated that... for some, overly, for other, justly (if their DM peppered the lightbearer with arrows long before they could retaliate, by playing enemies smartly).