Event Horizon wasn't terrible. For what it was, I enjoyed it, largely because it succeeded at being something appropriate for the genre. It felt at home. Resident Evil wasn't the Gothic/Survival Horror film it should've been, and thus felt like it was having an identity crisis, and missing some important context in regards to the source material; AVP was far too truncated and accelerated for it's own good, and also didn't seem to understand the film(s) made before it. Though perhaps I should scrutinize the Dark Horse graphic novels, instead, but coming at AVP purely from a moviegoer's perspective, I feel as though the homage the film should have been paying to the classics was sorely lacking.
That being said, I wouldn't have cared had it been well-made. Alas, for a film called Aliens versus Predator, there was very little actual combat. I liked these parts, more or less, but there wasn't nearly enough of it to justify the other 70-or-so minutes of boring human characters. There was little in the way of memorable suspense, dialogue or character interactions.