If you don't have anything negative to say or criticism to give, some people take it as them being better than you at the task that's being reviewed. I've foun

If you don't have anything negative to say or criticism to give, some people take it as them being better than you at the task that's being reviewed. I've found it better to have more criticism at the start and then reduce it over time, but that's getting into Machiavellian territory.