yeah a lot of the dark horse stuff was really good esp the first 3 graphic novels - as they act as a proper sequel to aliens which featured a traumatised hicks and newt trying to come to terms with the events of hadleys hope about 10 years after there return - ripley comes back in later in the series (they were made before alien 3 - but after the release of that movie the books were reconned and the names of newt and hicks changed so not to mess up the new time line). The first book was great and delt with the earth being over ran ( as you said above) If i remeber the alien queen can in those books can use a kinda physic link to plactate people into being more subservant and willing to be hosts or find people to be hosts (the cult) - it works pretty well in the book and i always thought it was a cool idea giving yourself up for impregnation with no control over it. (and another thing is that it complely makes prometheus invalid as the engineers are totally different in this book as there back story is kinda exaplained)
it was the second book that i really enjoyed where hicks/newt and another android are aboard a milatry cargo ship after the escape from earth that turns out to contain alien warrior specimens as some mad general on an off world colonly is trying to train then to become his own army so he can retake earth (guess what its doesnt go to plan lol) - plus the art work for this was amazing and reminded me a lot of some of the AD2000 stuff
earth war was the final book where ripley leads hicks and co across the universe to the alien homeworld to capture the alien king to use to stop earth being overran.
The whole series would have made a great movie trillogy. But im still annoyed as the best of the Dark Horse alien book will never be made - there Alien Vs Predator story was amazing and was set in the james cameron time line and one of the best alien / predator storys they ever did - their prob is the AVP first movie took a lot of it great ideas and butchered them