I wish Marlene's character was explored a bit more. Both in her relationship with Joel and with Ellie. Like having Joel actually care about her when she was shot in the beginning. Maybe more fighting side by side like in a flashback action sequence or training as the tutorial. And maybe a couple of character building non-combat scenes where Marlene and Joel swapped war stories.
That history is lightly implied but having it spelled out would make the ending have more impact IMO.
That history is lightly implied but having it spelled out would make the ending have more impact IMO.