This is the first game series where choices truly impact the story in ways we couldn’t have imagined troughout the series. Decisions made in the first game affect events in the third. The replayability in this series is immense.
The moral choices feel genuine, and the characters respond to them in meaningful ways. They're also so well-written and relatable that we grow attached to their stories and development as the game progresses.
Few games bring everything together so well, especially across multiple installments. I hope this new chapter brings back everything that makes Mass Effect an incredible game series (and also doesn’t cost a kidney for non-US gamers, nor demand a data-center level in equipment to run it).