SR-1 to be honest. SR2 had more screentime and more interactions but you know what I hate about it? Load screens... friggin load screens.
What I liked about ME1 was how seamless it felt. Go down to the lower deck? No loading screen but an elevator which masks the loading (and which only takes 3 seconds on PC compared to 20 on console) and if you dock on the citadel or anywhere else that's not a Mako area... then you manually have to exit the normandy from the pressure-lock door and you arrive exactly where the normandy is docked.
And as for the Citadel in ME3... did you know you can glitch through the floor in the Refugee Camp, you fall through the map and land physically on the presidium commons and the game renders it after 10 seconds. It means all floors are actually linked but because lolwut Consoles and PS3 memory issues Bioware decided to make each level load via loading screen when many were in fact directly connected via elevator.
That's what I'm talking about. If NME can't top that and sticks to loading screens which makes the entire experience that much more artificial, then I see it as a cop out.
It's next-gen and Bioware already has a lot of head-start with DA:I.. they can make elevators work well and they should... rather than boring and long loading screens.
/Offtopic:
For NME I hope we get a ship that's smaller and more intimite than SR2 but we get more time on foot and more squad conversations (with CINEDESIGN for gods sake) on foot with our squadmates.
Wait, you know what there really should be? Interior in the Mako where our squad could chat like the many enjoyable shuttle post and pre mission dialogues of ME3 (one of the best new things in that game)