I think part of the issue with the Bantam books has always been that these aren't unique stories (Hunters Planet snuck one in there) and it has always been other authors basically transcribing other peoples work. They are only going to be so good. I do have a certain fondness for Labyrinth, Berserker, and MOTS. I feel the Perry and Navarro both did better than what the comics did.
The random DH run that lasted a couple of years were pretty terrible. You can tell that ONE movie in the franchise influences 95% of the work in the EU and it gets stale. Some of the writers don't know how to play in the universe either. Which you get alot of in that mini DH run.
The newer stuff is getting better all the time though. Even the one where they woke up Ripley for a chapter between Alien and Aliens was better than quite a few of the old EU stories.
But none of them are high art.