I liked Oblivion. It didn't feel right seeing Tom Cruise as a techie repairman type guy, so the twist where he was once the leader of the human resistance made more sense, both for him as an actor and the story. Probably the sci-fi and hollywood community will give the clone-thing a rest for before it gets too played out. (Moon, Never Let me Go, Obvlivion)
If you liked Moon, have you seen Duncan Jones's (son of David Bowie) other movie, Source Code? That is fantastic! Neat quantum physics-type twist to the end... see that kind of ending to me is what helps make a film unforgettable.
Speaking of unforgettable, District 9 was such to me... which is why the sophomore effort Elysium by that director was a let down- it's watchable but I had higher expectations. With Elysium, Matt Damon and Jodie Foster were capable, and I like Sharlto Copley but I thought he played the bad guy way over the top, along with the Mexican arms/immigrant smuggler- their characters were kind of a distraction. The look was there, but the story seemed to lack the soul that District 9 had. I think Drone On and I have already had this discussion and you didn't like District 9? If you liked Elysium, to me District 9 was a lot more exciting with more complexity to the main character and the story.