At times I feel that way, and I'm only 30% in.I beat the story the other night and I am now having the same feeling as I did with GTA 4. That being a feeling of 'aloneness'. I never felt that way in the previous games but these past two have had such great stories that after it all ends and I'm just left to mess around with the open world I feel very alone, so much that I feel like its a bummer that people aren't calling me constantly to do stuff and I just turn the game off. I'm having a difficult time explaining the feeling. I love this game and still have cool & interesting side things I could do but I feel unmotivated to explore any of it without a story behind me. I suppose GTA games for me are now stories peppered with interesting things to do, rather than all the previous games being the other way around. Is this a common feeling?
I think I am arriving at the age of not being able to create my own fun by just walking around into random situations... there is not enough in between.
I am thinking that I am more of a Skyrim kind of guy now, where I can go off anywhere, and be distracted by things that I can use later (scavenging).. to make things more fun. I can use my time constructively to build my character.
I guess when I put in this much time, if I'm walking around for 2 hours I want to have accomplished something. Even in a video game I have a sense of deliverables. Too much in GTA leads to nothing. I die and its $5000, I do other things that only net $3000.
So it's also not efficient, unless you plow thru missions. Yet, it's sort of sandbox... Something is missing for me, part of it is that I'm almost 40 years old.