GTA V is my favourite game in the series but I completely agree with a lot of what you say here. The story conclusion in particular left me wanting a lot more and I could not help but be disappointed after the perfect way Red Dead Redemption finished and even the superior ending of IV. I really like GTA V and it will certainly be in my top ten of the year, and Trevor is one of my favourite characters in games now, but man it has a helluva lot of faults.
I expect Rome II, GTA V and hopefully Watch Dogs to have a shot at changing this up, and I have yet to play Tomb Raider, Heart of the Swarm, Gone Home or finish Fire Emblem Awakening. I also think that Killzone Shadow Fall, if pulled off right, could be incredible.
My current PC is 4 years old and has a list of problems, so I am upgrading to have a new machine ready for Rome II in September. I am fairly illiterate when it comes to putting together a PC, the specs and requirements, but these are the recommended specs for Rome II: