Here's the good:
They finally perfected the gameplay. The enemy AI is better than ever before. An inventory system is back without the annoying management that the first game had. Scanning for minerals is gone. Galactic exploration doesn't bring back vehicle sections but the Reaper alerts add at least some tension to it. The story pacing is great, well planned and immersive. The Continuity Porn
is there in abundance; the game does indeed address almost every choice you made in the previous games at least in some way.
The endings are RAGE INDUCINGLY DISAPPOINTING!!!
Seriously. When people, who finished the game before I did, started saying that the endings are a huge let-down I didn't believe it. I was loving the game and I just couldn't believe that they could be so bad that they would ruin the experience, but Bioware somehow managed to not notice how idiotic the options they gave us really are. A game who's major appeal is that the choices you make matter, that your Shepard's impact on the galaxy stays with you throughout the trilogy, for some imbecilic reason it makes all those choices moot in the end. Just because the "push this button to get a bleak future" thing worked for a dystopian conspiracy story like Deus Ex
doesn't mean it will work for an epic Space Opera
So that up there is what it was like before the Extended Cut, but is it better now?
Yes, it absolutely is! The loose threads of plot that were left hanging are tied up, gone is the lack of closure and ambiguous fates of beloved characters, gone is any implication of accidental galactic holocaust or the fall of galactic civilization as we knew it(well, with a notable exception). The unexplained space magic, a.k.a synthesis, remains but I suppose that asking for perfection would be too much. This DLC fixed a lot more than I thought it would, so kudos to you, Bio Ware