It would be interesting to read if there are anything in particular that you disagree with? Which objections did Darwin handle and where?
Darwin's understanding of e.g. Heredity via Pangenesis turned out to be wrong, so it is not like just holding up a copy of 'On the Origin of Species' as the final judge of "origin reasoning" will take use very far.
He spends a long time dismantling objections I've heard creationists use to this day. I've often wondered if the creationist influencers who came up with these "objections" actually read On the Origin of Species.
The mechanism wasn't understood at the time yea. That's not really relevant, and not really covered in Origin of Species anyway.
Spoiler warning: Darwin didn't really have any problems with the eye. That's just something creationists say.