I am sure most of us who bought the game have beat it.

So Which ending did you pick?

Which Character did you like?

which mission did you like the most?

What do you hope out of future DLC Stories?

Almost 70% complete >_< I'm taking my time. But when I do. I'll post here what I think.

So Which ending did you pick?
Michael was dead and I have no recollection of it.  I'll save everyone on my next playthrough.

Which Character did you like?
Trevor is just so damn unpredictable, suits me when I abandon everything for random shooting sprees.

which mission did you like the most?
Again I am the kinda guy who'll start doing a mission, then just abandon everything start shooting and chase the pedestrians or just blow shit up for a giggle.  I take it pretty personally when I miss someone with a sniper rifle, hunt them down and what not. I guess the Rampage missions?
 
What do you hope out of future DLC Stories?
Chainsaw, how I've missed it.  I actually want more missions covering more of the map and not just stuck in the same ol area.

So Which ending did you pick?
Killed Trevor.

Which Character did you like?
Lamar.

which mission did you like the most?
..Any of the heists, basically. They were all long and challenging; I liked it.

What do you hope out of future DLC Stories?
Kinda like what Caine said, expand missions across the map.

So Which ending did you pick?
I did all three.

Which Character did you like?
Wade.

which mission did you like the most?
Probably the jewelry store heist.

What do you hope out of future DLC Stories?
I don't plan on getting the DLC.