The story ins't weak, it's the people who dind't understand it who are weak.
And the game weights around 18 GB, Vice City weights about 500mb.
So in all honesty the 5 years were well deserved.
Maybe because Vice City came out over a decade ago? It's over 1.5 GB anyway, I don't know where you got 500 MB. You can't compare file sizes for a game that came out over 11 years ago to a game that came out last year.
The story is weak, there are clear signs that they rushed it, lots of it makes no sense, the characters are weak too, they're easily forgettable, maybe many can't understand the story because the story itself doesn't make any sense. Don't say I found the story bad because I didn't understand it, I understood it fine, it was the story that didn't understand itself, but opinions aren't allowed here, I either have to praise the game, or leave.
Why does buying three masks count as a full "action-packed" mission? Michael Bay himself must have jumped from his chair from all that action, just like how parking a car, or taking a car, counted as a full mission, it's just a cheap way to increase the mission number. Maybe we would have gotten something half-decent if they spent all of the development time on single player...
Oh, I've seen you around here, you praise GTA V like it's the best game ever, and aggressively yell at those who even give the slightest bit of criticism, but apparently it's perfectly fine for you to rant on about how bad GTA IV is. So I'm expecting some angry response from you, because I criticised your "perfect" game.