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The aliens in Mass Effect are so boring.
Other than the Salarians none of the aliens are designed to feel like they exist outside of combat scenarios, and well the Asari but the Asari are just the same blue chick in leather and Star Trek head ridges.
The most interesting species in Mass Effect are the Salarians and the Geth, the Salarians because they are literally all fucking assholes , borderline nazis who play god on the regular and would probably be the villains of any story if they didn't have profitable relationships with the other 2 main races of the counsil. And the Geth who are a collective AI who has developed religious beliefs.
I think the Krogans pose an interesting sci-fi ethical problem. Them and the Salarians come as peas in a pod because the Genophage is good sci-fi
Mordin is the best character in the series, and ridoculously well written in general, makes all other character feel so simplistic just by being around, might be why they kill him so early into the 3rd game.
I had no interest in Mordin since most of the salarians were boring but damn did he turn in to one of my top 3 characters near the end of the second game!
Also biotic volus god master race!