Except we all know the only reason the character of Dr. Marcus exists is because she had Kirk's baby in the prime universe.
I was absolutely thrilled with Lt. Darwin.
In some of the older TOS movies, TMP in particular, there are people of ALL ages and weights (not a Shatner jest) on the ship. Many people seemingly at least 60 and not Hollywood 60 either. It's such a shock to see because age and weight diversity have been erased from Star Trek unless the whole point of the character is that they are old or a fat stereotype (Klingon cook in DS0, Opera singer in TNG).