Let me start by saying I really enjoyed playing the Mass Effect games. They are awesome.

I found the plot, though, incoherent. Especially in ME3. I don't mind small conveniences like "good thing this random teleporter beam designed to suck up corpses has easy entrée to the reaper's command center," because it's a game.

But how on earth did Cerberus amass seemingly billions of elite special operations forces with nobody noticing? What do you mean the secret weapon against the reapers has been improved each cycle by people who didn't know what it was supposed to do? How could that possibly result in a functional device?

It's clear, I think, that this wasn't necessarily the direction the first game was going. Cerberus was the subject of a side quest, but nothing more. The authors of the lore seemed to be taking great pains to ensure everything was logical, based on the in-universe rules they had established.

...and then ME2 kicks off and the series is almost as much about Cerberus, from this point on, as it is about the reapers.

What did you think about how the plot unrolled?

(You may also wish to read this series of essays. It's about 18 billion words long, though - fair warning. https://www.shamusyoung.com/twentysidedtale/?p=27792)