Ending was a mind fuck right? It was the funnest game I ever played. I'd recommend the past 2 if you didn't play them, not as much fun (jumping on and off shit) but they're fun too.
Have they released new DLC? I know they were going to and I saw that it should all be out by 20(14) and I was like fuck that. I ended up needing to sell it for an emergency but still, 2014 is too far away. For a game at least.
Hopefully the dlc adds an alternate storyline. My gameplay experience was WAY different then what I saw in a walk through. I thought maybe the decisions you made altered the story, never went back to check.