It's a question that can be extrapolated to many games from last gen. I'm not sure why the original Mass Effect is singled out. There was no 'pass' given that I can see at least. It's sitting at a 91 MC, not some GTAV/LoZ tier 97-98. Reviewers clearly pointed out things like technical issues and some design problems. The narrative, world building and characters were excellent in ME1, which is what propelled its status.Try to abstract things a little.
Another way to ask this question is this: Would a Bioware game with all the massive issues ME1 had be well receveid today if some aspects of it, namely narrative, world building and characters, were excellent?
Or... what allowed Mass Effect to get a pass for all its problems back in 2007? Are these elements still present today?
The point is ME1 felt fresh in 2007, despite its issues. There's no way it'd be as well received today simply because it should be viewed as a product of its time. Since then, many studios have implemented conversation wheels, characters as squadmates, branching narrative, sprawling sci-fi worlds, etc. It wouldn't really stand out.