Sometimes its just easier to tell it like it is. We so often fool ourselves into thinking we're actually sparing feelings, or being polite, or just letting people live but sometimes, very rarely, it helps to just say what's on your mind. Sure, it may hurt a feeling or two, damage a relationship, ostracize you from a group, but however much the truth hurts, it is still at the end of very long days, the best of all possible scenarios.
Speak the truth. As much as you can.