Mass Effect 2 holds the crown for everything in the series. Story, gameplay, characters, quests. If there's one thing I want more improved it's the conversation system. There was never any urgency to conversations because you could stand there for as long as you wanted to choose what you wanted to say. Bioware could learn from The Walking Dead games from TellTale. Most conversations had a time limit to choose a response which really added tension to the moment and forced you to make a decision on the fly.