No.
It would be okay to shoot marines like CoD and Aliens like fucking Aliens.
As far as we know, the game that came out has nothing to do with what Sega wanted.
That's what I'm talking about. Even if SEGA did state that they wanted the game to feel like CoD, that doesn't excuse the way Gearbox and the other devs programmed the game and the enemies. In fact, I could imagine a game with great human enemy AI and great alien enemy AI to be a lot of fun. You take on other humans who act as enemy human soldiers do, while the aliens attack their own way. Also, I'd think with the aliens a less is more approach would have been better. From the videos I see, the aliens are far too numerous and they don't attack as aliens do. If aliens were a rarer occurance (not super rare, but not as common as squirrels), and attacked with a very unique alien style, they could be scary as they're meant to be.
Imagine playing a soldier vs. soldier game, but there is always the threat of an alien lurking in the shadows? To me, that's pretty fucking scary. You have to be able to perform basic combat, but also have to keep your senses open for alien attacks (who could assist you in attacking enemy soldiers or hurt you by attacking you and your own men).
That sort of scenario actually reminds me of Jurassic Park 2, where it was human vs. human, but there were velociraptors and other dinosaurs also on the prowl.