BioWare just wasn't fit to do a trilogy of games with focus on player choice and save game import and everything as ME was intended. It might have worked if they had things better planned out, but as it is the trilogy regularly built up expectations it could never fully live up to. I'm blaming myself for falling for that, but also BioWare for not doing much to adjust those expectations.
Less would have been more in quite a few instances, but then the games would have lost a certain part of their appeal. The problems were more than noticeable within the trilogy itself, but after it was over the difficulties of the transitions from one game to another were continued in a bigger scale for the whole ME franchise.
They invited some trouble with the introduction of the Reaper threat in Mass Effect.
They brought themselves into serious trouble with the Suicide Mission etc in ME2.
They drove the whole thing against the wall with the galaxy changing endings of ME3.
They couldn't continue after Shepard's story without declaring some scenario as canon. They don't want that, so they worked out a way to avoid having to deal with the unpleasant aspects of the ME franchise as it presented itself so far.Grab the cool stuff and run for Andromeda, or that's how it seems to be.
Which might be a bit disappointing for me, if I still cared about ME or Bioware as I did when ME3 was released. I don't, so, urm, whatever. If ME:A turns out to be good I'll play it someday when the DLC cycle is through. If not... well, too bad. ![=]](https://lvlt.forum.bioware.com/public/style_emoticons/default/sideways.png)