Just as another data point as far as the metaethics sequence:

Seemed to me to make sense, to "click" with me fairly well when I read it. (A couple bits perhaps were slower/tougher for me, like the injunction stuff and moral responsibility, but overall I feel that I grasped the ideas.)

Just to verify (to avoid (double) illusions of transparency), here's my super hyper summarized understanding of it: Morality is objective, and humans happen (for various reasons) to be the sort of beings that actually care about morality, as opposed to caring about something else (like pebblesorting or paperclipping). Further, we indeed should be moral, where by "should", I am appealing to, well, that particular standard known as "morality". And similarly, it is indeed objectively better (that is, more moral) to be moral.

Further, morality includes such values as happiness, consciousness, novelty, self determination, etc...

(Of course, this skips subtleties like how we're not fully reflective so it's difficult for us to explicitly fully state the core underlying rules we use to judge morality, and the fact that those rules include rules for what sort of arguments to accept to update our present understanding, etc...)

Anyways, take that as a data point (plus or minus, depending on how well my understanding, as represented in the summary, reflects the actual intended concepts.)