It certainly over-idealises the Slytherins. The Gryffindors do have flaws - all humans do - but it should be possible to show that without rushing to the opposite extreme.
As far as the train goes, the Gryffindors had ample provocation, but does that make it right? That is an age-old question, with no clear answers. A fairer fic would establish that there were faults on both sides, though definitely not evenly balanced, and let the reader draw their own conclusion.
Overall, I'd say that the Gryffindor in general are so certain they are right as to be on the verge of hubris - consider Hermione and the house elves - and hubris is always dangerous. If you don't believe you can cross the line, you probably won't try not to. However, that is only a potential danger. The Slytherins we know about have crossed the line long since, making them considerably worse the our heros.
Aside from the characterisation issues, it is a well-written story, with some powerful scenes, especially considering it appears to be only the author's second fic. (Their first wasn't bad, as such, but centring the story on a chess tournament was not a good idea.) The author does have talent, but also a skewed idea of the Potterverse. It'd be interesting to see them in another fandom, or even attempting something original.
As far as the train goes, the Gryffindors had ample provocation, but does that make it right? That is an age-old question, with no clear answers. A fairer fic would establish that there were faults on both sides, though definitely not evenly balanced, and let the reader draw their own conclusion.
Overall, I'd say that the Gryffindor in general are so certain they are right as to be on the verge of hubris - consider Hermione and the house elves - and hubris is always dangerous. If you don't believe you can cross the line, you probably won't try not to. However, that is only a potential danger. The Slytherins we know about have crossed the line long since, making them considerably worse the our heros.
Aside from the characterisation issues, it is a well-written story, with some powerful scenes, especially considering it appears to be only the author's second fic. (Their first wasn't bad, as such, but centring the story on a chess tournament was not a good idea.) The author does have talent, but also a skewed idea of the Potterverse. It'd be interesting to see them in another fandom, or even attempting something original.