The story derailed for me just from the start when he bought Riddle's Phoenix wand from Ollivander while Riddle had Harry's Holy wand. It didn't make sense to me nor was there ever an explanation. The story then just added plot holes and missed opportunities

 

Delenda Est had those guilty pleasure vibes from the beginning, so the forward time-skip and the drop in quality didn't really surprise me.

The Sum of their Parts is a lot longer than my memory of it suggests it would be. I don't remember much actually happening. I remember the portrait of Dorea Black really ticking me off though.

Stranger in an Unholy Land seemed to have been popular several years back, but I never understood the appeal. After the Room of Requirement scene with his sister, I couldn't force myself to continue reading anymore.