It sounds awesome but it must be impossibly heavy amounts of pressure on Bioware and I wonder if it's like the Butterfly Effect in games where if you do one thing differently everything changes.
For instance, in my standard playthrough of Mass Effect I always romanced Ashley, always saved the Rachni, always helped the colonists on Feros, always managed to get Wrex to calm down, always managed to save the Council in the end.
However in my first playthrough I actually messed up and got Kirrahe killed in the mission on Virmire and I now wonder how that will effect my upcoming playthroughs. Also in my first playthrough I slept with the Asari Consort before moving on to Ashley so I wonder if that will turn up anywhere in the plot?
Now my default Mass Effect 2 plot, always stayed faithful to Ashley, managed to save my entire team, destroyed the base, reprogrammed the Heretics, made Mordin hold onto the genophage cure to help the Krogan, killed the Thresher Maw, didn't have Tali get exiled, didn't kill Sidonis, and had Morinith killed... essentially all the paragon things I did.
Part of me would be curious of what would happen if I did just one thing differently but as it stands it would be interesting just to see where the plot goes from here.
So I'm hoping for a perfect Mass Effect 3 that has everything I want but I am slightly curious to see how many different variables there could be in the meantime.
That said, some things Bioware might overlook and/or not acknowledge. An example of this is the possible character development of Ashley or Kaidan. The former of which you can convert into trusting aliens and liking the Council and being proud to fight alongside them and the latter of which you can turn into an angry xenophobic alien hater who spits in disgust at the thought of them.
But then in Mass Effect 3, they just revert back to defaults... regardless of whether you made the switch or not. Ashley once again goes back to her stance of not being a 'fan' of aliens, despite having in the last moment of the first game announced that she did trust the Council damn near completely. (though she does still say she doesn't like how Cerberus is 'extremist' so that's a start)
And Kaidan who you can have slur and hope that the 'alien bastards get to see what humanity can do' ends up leaving expressing his undying trust in the Council.
It's as if the game couldn't register optional character development moments so they didn't bother with them, I would hope that this doesn't happen in Mass Effect 3.
Also I suspect I will have to go back and replay Mass Effects 1 and 2 again just so I can paragon Ashley (I admit it wasn't until after I had stopped playing Mass Effect altogether that I even realized you could do that) just in case it does have some kind of effect in Mass Effect 3. Also want to make doubly sure that all my other choices are perfect as well.