If you want to keep your current manager (not sure if you would), some managers belong to a professional body you could advise the professional body
Ultimately the Strata Managers are paid for by you and the other owners to run the strata how you want (within the confines of the law and the Strata Bylaws).
I think if other owners are unhappy to get the EC together and discuss the managers with an email advising them of what you expect from them and how you want the strata run.
If they are unwilling to change then start the process of finding a new manager. Just be careful to sack them by the law and nicely. I had a bad experience when we got rid of our strata manager she was extremely difficult to get the paperwork from.