Plenty disagree with the court decision.
The Lord Chief Justice and the Master of the Rolls for example.
Even Lord Sumption, a now retired Supreme Court Judge on Radio 4 this morning thought tthey had made an error.
It was a decision that nobody saw coming.
It has made new law.

There are some unusual inconsistences in the judgement as highlighted by some of the pieces written and comments made.

Paragraph 58 the judges advise they are not interested in the PM's motives.

Paragraph 61 they advise that they cannot find a good reason to prorogue.

That sounds like a judgement on motive.