I don't understand the whole "Killing same old enemies" complaint I keep seeing.
What did people expect? All of the existing lore to go out the window? The 4/5 current races just to go away?
This complaint sounds like complaining about Orcs or Star Troopers in LOTR and Star Wars games.
Not really. For a game about exploration and adventures in space when you get a sequel with a bigass 2 on it, you don't expect to have your barrel pointed at almost the exact same enemies with little new.