Not all is lost! I've read that if you follow the paragon path, then it's possible Samara is a romance option in ME3, and she can give you a sidequest similar to the Miranda one. You'll go to a hidden Justicar temple and learn how to bring one of your characters back from the dead. It just sucks that it was Mordin since his important parts are pretty early in the game, but you'll get to see his later stuff.