Use 'have a problem with' to criticize softly, showing that the issue is your concern rather than blaming. I have a problem with this report's accuracy.
Pro Tip 2/3
Personal Discomfort
Express quandary or inconvenience without direct confrontation, useful in polite or indirect communication. I have a problem with the meeting time.
Pro Tip 3/3
Subtle Opposition
Indicate disagreement with ideas or methods in a less aggressive manner. I have a problem with the proposed strategy.