I've looked through the forum for ME3 and it's completely dominated by countless threads discussing the ending. Yes the ending is unfulfilling. But I think people have to think about what happened preceding the ending. This is a great game full of truly memorable moments.
Please just look past the ending and think about something that made you excited, sad, or satisfied that happened before the end.
I really loved Mordin's death. It was really moving as he sacrificed himself to save a species that his people have punished for centuries. Plus he started singing... almost made me cry.