What is the best soundtrack in the series?

I'm going to have to go with ME1 then.  I just thought that game was excellently scored.  The first scene when you're walking through the Normandy to the theme before you go through the relay for the first time.  The hold the hold the line speech, when Saren kills himself and falls through the glass, rescuing the Destiny Ascension, coming out of the rubble. That somber music playing after Virmire.  I can still hear it all.  Was just great all around.

ME2 was close because I think ME2 had by far the best battle themes, especially in it's DLCs.  The battle themes in Overlord, LOTSB, Stolen Memory were awesome.  Overlord is probably my favorite battle theme in the series.

ME3 - The first scene leaving Earth was powerful for me, but I can't really think of others that stood out in the game.

ME:A - I still think my game was bugged or something because I hardly ever heard any music.  Even in the videos I captured, there's no music or it's really faint drowned out by the other sounds.  I've listened to some tracks, but if we're counting how the game was scored, I don't have much to go off of.

It was appropriate to the scene in most cases, but it was meant to be single contribution to the palette, and it was effective. Sadly, Andromeda never even gave us much in that regard. 

All of Dragon Age, including the music by the poet in Inquisition, was so well done. Oh my goodness... Bioware has a real rich tradition in music going all the way back to Baldur's Gate. Andromeda comes up short in quantity and in the case, it's just too noticeable. Bioware knows musical talent and gets those that are passionate, but not yet mainstream, to promote or perform for that title. For crying out loud, talk about self-awareness with Rag-N-Bone-Man

The song during the end credits of Oriigins brings me near to tears when I hear it. SO beautiful! 

The song during the end credits of Oriigins brings me near to tears when I hear it. SO beautiful!