I personally think most of the issues people point to are fairly surface-level stuff that doesn’t really damage the movie as a whole. A second Death Star makes sense in-universe.
Return of the Jedi is a great movie, but I kind of think this is a stretch. The last one didn’t work, why would a second one with essentially no changes work this time? Palpatine gets a surprise attack on the Rebels I guess, but he still dies, they still lose the Sanctuary Moon, and the loss on Endor doomed the Empire.
Just because your expensive military hardware is destroyed in a battle, you do not simply stop making that hardware. When a country lost a capital warship during the World War I or World War II, they did not just say “oh that did not work, let’s stop building new ones” or “oh that did not work, let’s just stick to building small torpedo boats instead”. Even after it was crystal clear that a battleship are completely worthless compared to an aircraft carrier, countries still continued to build them. So the argument that Empire should not build another death star just because the first one was lost is beyond ridiculous.
While one might argue that DS2 is unoriginal from story perspective, it is very logical from in-universe military and logistics perspective, which is backed up by numerous real history examples.