I think the writers got a little too excited with all the ideas they wanted to include. In just six issues, they tried to mix in everything: continuing the arcs of Newt and Hicks, a mission to the Alien homeworld, the appearance of a living Space Jockey, the homeworld being nuked, and Earth being overrun. On top of that, there’s a cult worshipping the Xenomorphs, preaching submission to becoming hosts for chestbursters — all part of the Alien Queen’s grand plan, which manipulates both human fear and their longing for motherly love. Ultimately, the Aliens spread everywhere, civilisation collapses, and when Newt and Hicks finally return to Earth, it’s already too late — all that’s left to do is flee.
I found all of these ideas to be quite good, but there are so many, that the comic ends up collapsing under their weight. The first issue has a decent pace, but the later ones feel rushed, as if the writers suddenly realised they were running out of space. Whole chunks of story are crammed into fewer and fewer panels, leaving the action underdeveloped and poorly explained. The characters suffer the most from this. Aside from Newt and Hicks, most of them are so underwritten you barely remember their names — and the art doesn’t help. Faces are messy and inconsistent, often changing from panel to panel. With the Marines all dressed the same, it was nearly impossible to tell who was who. Apart from Hicks (only recognisable because of his scar) and maybe two or three others, everyone blurred together.
And even though Newt and Hicks are the focus, their development is frustratingly shallow. Both get plenty of inner monologues, but nearly all of them circle back to Acheron. Yes, it’s believable they’re traumatised, but it becomes repetitive to the point of parody. I wished they had something else to say. There’s an attempt to expand Newt’s arc with a romance subplot, but it’s so rushed it feels absurd: after a single conversation, she’s suddenly “involved” with a Marine whose only memorable trait is that he later turns out to be an android. Beyond that twist, there’s almost nothing unique about him — or most of the other characters.
Another disappointment is Ripley’s absence. She’s only mentioned twice, with no explanation of her fate. I expected Newt and Hicks to at least talk about her, but they barely interact with each other at all.
Three years after Outbreak, Alien 3 came out and effectively retconned this whole storyline. Honestly, I’m glad they didn’t adapt it for the film. The comic isn’t childish in theme, but the way the story is told feels far less mature than the movies. I understand why fans were upset that Newt and Hicks were killed off-screen in Alien 3, but in this comic, they didn’t feel alive either — more like shadows of their film selves.
I’ll probably give Nightmare Asylum a try, but with low expectations.
EDIT: After having read Nightmare Asylum, I must say that Outbreak is worth reading. I don't think it's better now, but Nightmare Asylum is really good, and you probably need to have read Outbreak to better understand the context.