Don't get your hopes up people, the verdict is not really objective by any means.
He obviously had the right to prorogue it (not that I agree with it), so this is totally uncalled for, and just adds fuel to the smelly fire British Politics has become.
Plus, this doesn't change a single thing Brexit-wise, as the no-deal Law was already passed.
The Court of Session is very conservative (small-c) which is why no one really expected this decision. The judges in question aren't exactly mavericks doing things that they believe over anything else: they'd have not made it to the Court of Session if they did.
To my admittedly rather limited understanding and from what I've read: its a decision that makes sense when you consider the unique differences with Scots law and English law - especially when it comes to constitutional law. The main thing that we've seen here is that the High Court in London ruled that it wasn't for the courts to determine whether or not a prorogation was justified: the Court of Session in Edinburgh ruled that it was for them to decide and that it wasn't. This is broadly in line with the general differences between Scots and English law - the big example is that Parliamentary Supremecy is absolute in England and isn't in Scotland; which is believed gives the courts more of a say into constitutional matters - the traditional example is that its believed that Parliament can't amend the Act of Union 1707 to eliminate Scots Law or to fiddle with the rights of the Church of Scotland or whatever since in Scots Law parliament isn't entirely supreme over key elements of the constitution. None of this has been tested in the courts and I guess that this is the first time that we'll see what happens.
Both cases are being examined on Tuesday - key thing to remember though is that although they deal with the same matter because one was filed in England and the other in Scotland they can't just be rolled together: and since a key element of the constitution is that Scots and English law are equal the Cherry case will be considered using Scots law which means that the Court may well find standing in that case and not in the other one. I'm not entirely sure what happens if its found to be lawful in English law and unlawful in Scots law and I don't think anyone does - my hunch would be that its a case of if its unlawful anywhere then its unlawful across the UK so prorogation would end but we'll see.
Its more the things that the court said about the decision as well: they basically accused the government of lying to the Palace to get the Queen to do something and that puts the Palace in an awkward spot for obvious reasons: and that's the sort of thing that ordinarily would be a resignation offense but not with this government that doesn't care about thinking things like ethics.
That's about as clear as I can make it - its a fluid, confusing issue with very little precedent.