I haven't even unlocked Trevor yet, and honestly I'm finding it a struggle to keep going through the story missions. I love the world of the game and think it's the best there is in just about every way. It's an awesome sandbox.
My problem with the story mostly lies with Franklin and his story. Micheal is pretty awesome so far. And a lot of times I wish the story focused only on him. Every time I have to switch to Trevor for some kind of mission I'm treated to excessive swearing every other word, and the 'N' word every other sentence. Along with a lot of slang and street talk that's almost impossible for me to make heads or tales of. It's wearing on me, and all of his 'friends' are complete idiots. Does this continue throughout the entire game? Not sure how much of it I can tolerate. It might be realistic, but I was never a fan of this sort of thing.
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Yes it does, to some extent at least! Although I disagree with you, I really enjoyed the early Franklin missions and thought they were quite funny. Franklin is probably my favourite GTA protagonist of all time to be fair. But anyway, yes it does.