He is good for transitioning to more radical socialism but he's an opportunist. He tries on multiple occasions to wash away the faults of capitalism, either by saying that we have entered a new system he calls "technofeudalism" which is somehow different than Lenin's imperialism and that we need to fix capitalism through technocratic means (workers get an equal share of companies but the capitalist system does not get torn apart), or by attacking actually existing socialism in history by saying that it's undemocratic and authoritarian.
He is open to working together with other opportunists instead of defending correct socialist theory, and the members of his party that take part in syndicalism always take weird positions, sometimes defending the companies, and all around not being nearly radical enough.
I believe they contribute to the working class movement positively and that they would eventually ally with the communists if it came to revolution, but they need to be treated with caution just like the other socdems.