Science fiction is about humans of today. That's why it has artistic merit.
Is that what you're reading from my comment? Science Fiction CAN be about the humans of today, but it doesn't have to. This is just preference, but for me ME was always one of the most boring aspects of Science Fiction. Not just because of the plot, but due to the whole generic approach on literaly everything. I think Walp descriped it perfectly here, so I don't believe I can add to much to that.
But just to say this, for me personaly Science Fiction becomes actually interesting, the moment you have something 'truly' alien and which can't be explained with a normal rational approach. Think about the creature and situation in Alien for example or Space Odyssey, Clockwork Orange and so on. This is what Science Fiction is for me personaly. Something that makes you actually think. And not everything needs an explanation, like Alien for example, the history of the ceature and where it comes from is absolutely secondary, it literaly represents the unkown and the disturbing reality that comes with it, while 'normal' people are now forced to deal with the situation.
And the approach of mass effect is so generic, that it barely qualifies as Science Fiction in my book. It never really approaches the difficulties and hypotehtical questions that pop up when you ask your self, how humans would deal with aliens. The creatures in ME do not just look humanoid, they often act very humanoid.
What disapoints me is that Mass Effect doesn't actually exploit the unique qualities of gaming as a medium and the qualties that come with role playing in particular - puting your self in the shoes of someone else with choices and consequences. One huge aspect that really sets games apart from books and movies, is the interactive quality, the player engagement the fact that you push the narative and that you can shape the game, that you are the actor here rather than just the observer. Sadly as Bioware has become one of the 'big' studios now, they make interactive movies rather than a game that is actually using this unique trait of gaming to the fullest potential.
Seriously, why not create a game where you're have some kind of alien species, with it's own history, culture and all the depth that comes with it, and make the player a part of that race and then throw him in to human space! Think about playing a character like the 'Geth' or something similar to the 'Reapers' even, something that is extremly alien to our understanding and making something with that. It's really like neither Bioware nor gaming in general has really evolved as a medium in the recent years, the graphics and the hardware got better, that much is for sure - well debatable with Andromedas faces ... But, is that really EVERYTHING there is to gaming these days? How great they look?
Science fiction should be written to talk about social issues and how they relate to humanity.
It can be, but it doesn't have to. There are a lot of Science Fiction novels writen from the perspective of alien species, of which some have contact to humans, while others don't.
One big aspect of Science Fiction is the "What-If". You can explore topics that you couldn't explore otherwise. Like how a machine society would look like, for example. There is a reason why so many people actually hate what they made from the Borg in Star Trek by making them more like an 'villain' with actual human motivation trough the Borg Queen. Before that, it didn't even seem possible for the Federation to ever get in contact with the Borg, for the very simple reason that the Borg see absolutely no interest in conversation and exchange, they simply assimilate, that is their definition of an 'exchange' of cultures. By actually making them closer to something that humans can comprehend ... you also make them boring and generic. But it makes it easier to write a plot around that ... And that is the approach behind ME as well. Making everything as easy as possible to digest for the audience, do not dare to challange them! Or actually leaving them in a place where they have to figure something out on their own.