Gah, my detailed reply just got eaten when I accidentally clicked on one of the adverts on the side. Anyway I try and rewrite, keeping it a bit briefer.
I would argue that the plot isn't really that unfocused in any of the first three books. (Books four and five are more problematic, there's lots of good stuff in them, however given that they are happening at the same time and given that Martin had to finish book five earlier in the story than he was intending because he was seriously late with it, the plot there is kind of unfocused) Anyway...
Book/Season 1: Focuses on court politics, one of namely the animosity that starts between the Starks and Lannisters after the apparent murder of one of the Starks relatives (Jon Arryn), leading to the eventual civil war over the throne.
Book/Season 2: Focuses on war; from Sansa and Tyrion we see the war from the court's perspective, Catlyn sees the war from the field, Arya sees the effect of the war on ordinary people; Bran deals with the running of the estates by the old and young while the adult males are away fighting.
Book/Season 3: Focuses on political maneuverings off the battlefield. Hostages are exchanged (or not as it turns out), Marriages are made. Despite winning all the battles, Robb loses the war (and his head) because of betrayal by his own men.
The slight complications comes from the fact that at the same time you have separate stories from Dany and Jon Snow going on. Again I'd argue that each of these stories has a clear arc for each book/season (i.e. for Jon you have 1) Basic training at the wall 2) Travelling north of the wall 3) Joining the Wildings) For the first three books these don't really join up with the main story that much, but I'd argue they are interesting in their own right so it doesn't matter.
I think the video is perhaps right in that more could be made of the White Walkers, after all even by the end of book five we still don't know much about them; whether they are a force of nature or controlled by some sort of dark lord. It is interesting to wonder if the books could have had an extra character who travelled further north and interact with them in some way so the reader/viewer knows more about the threat, even if the other characters don't (Benjen Stark, Ned's nightwatchman brother, who disappeared in season 1 might have been a good POV character for this, assuming he's still alive). I'm not sure if this would be an improvement or not.
I would argue that the plot isn't really that unfocused in any of the first three books. (Books four and five are more problematic, there's lots of good stuff in them, however given that they are happening at the same time and given that Martin had to finish book five earlier in the story than he was intending because he was seriously late with it, the plot there is kind of unfocused) Anyway...
Book/Season 1: Focuses on court politics, one of namely the animosity that starts between the Starks and Lannisters after the apparent murder of one of the Starks relatives (Jon Arryn), leading to the eventual civil war over the throne.
Book/Season 2: Focuses on war; from Sansa and Tyrion we see the war from the court's perspective, Catlyn sees the war from the field, Arya sees the effect of the war on ordinary people; Bran deals with the running of the estates by the old and young while the adult males are away fighting.
Book/Season 3: Focuses on political maneuverings off the battlefield. Hostages are exchanged (or not as it turns out), Marriages are made. Despite winning all the battles, Robb loses the war (and his head) because of betrayal by his own men.
The slight complications comes from the fact that at the same time you have separate stories from Dany and Jon Snow going on. Again I'd argue that each of these stories has a clear arc for each book/season (i.e. for Jon you have 1) Basic training at the wall 2) Travelling north of the wall 3) Joining the Wildings) For the first three books these don't really join up with the main story that much, but I'd argue they are interesting in their own right so it doesn't matter.
I think the video is perhaps right in that more could be made of the White Walkers, after all even by the end of book five we still don't know much about them; whether they are a force of nature or controlled by some sort of dark lord. It is interesting to wonder if the books could have had an extra character who travelled further north and interact with them in some way so the reader/viewer knows more about the threat, even if the other characters don't (Benjen Stark, Ned's nightwatchman brother, who disappeared in season 1 might have been a good POV character for this, assuming he's still alive). I'm not sure if this would be an improvement or not.