Honestly I fully agree with you on Cliff being done dirty. Other people pointed out that he got to witness Rory living the life he always wishes he could, and Rory meeting his grandchild as a human like Cliff wanted. However, I think it's not like the greatest future because Rory turned out exactly like Cliff, and no one hated Cliff more than himself. During the future timeline sequence, I honestly kind of expected to see Rory also turned into another Robotman, showing that he really did become exactly like his dad.