To me it feels like there needs to be more information before we can come to a judgement (excluding bias aside). I don't feel like "failing to include" people is necessarily an indication that a manager is bad... rather it feels like his communication style clashes with your preference. There are plenty of places where information is shared on the "need-to-know" basis. Is the manager not including your team on things that your team should be knowing?
Was the manager also given a fair chance to receive the feedback and take action on it?