Well, I have just finished XIII. It took me around 50 hours to get to the ending. I must admit, for a while, I thought I would not get there. Lots of boss fights in a row without the option of saving. But in the end, I did it. This is the first Final Fantasy game that I have officially finished. I am very satisfied with the ending and game in general. I gave up on X and XII too fast, I can see it now.
So, what does the future holds for me? First off, XIII-2. I started it tonight and played it for an hour. I love it so far. Since I have just finished XIII, it's fun to get right into it. After that, I'll give X and XII another go. If I am still in the mood after that, X-2.
I'll mix things up with Kingdoms of Amalur (another great game by the way) and maybe try and finish the main story in Skyrim.