Abandoning the save import function is not the way to go with the series. It is one of the unique aspects of the Bioware games that separates them from the rest and it is something that can be a major pillar of their new series if done right.
This. Abandoning the save import function would be similar to what they di with exploration in ME2 and ME3. The concept was fine but poorly executed in ME1 so lets scrap exploration in the sequels.
This is not the way to go. The import fuction should continue and should be improved.
While the big decisions like saving the council, the rachni queen and the collector base only had cosmetic consequences, I feel that smaller decisions were handled correctly.
I mean stuff like Raan remembering Legion if you brought to Tali's trial, Jack remembering holding the bubble if she was the biotic specialist or Tali talking about the vents if she was in vents during the Suicide Mission really help to make your experience unique.
Plus who wasn't satisfied with Conrad Verner in Mass Effect 3, when he brings up two relatively smalll side quests from ME1? I definitly was.
Also regarding big choices, I think that the Genophage arc throughout the ME trilogy was handled correctly most of the times. Filled with choice and consequence.