I have had to call out our DM on a few occasions recently. The problem was/is that I felt he was calling for checks, just for the sake of having us roll dice. Every single person we met would be a diplomacy check. If we failed one check, everyone else would turn on us. I had to tell him that the only reason he had us making checks is so eventually we would fail. I don't mind making a check in a situation requiring some kind of skill, but too many checks can bog down the game. We spent over an hour trying to jump across a few obstacles because he wouldn't allow us to take 10, even though there were no enemies in the room, nothing threatening us. When your DM is determined to keep you from succeeding, you need to speak up and say something. The reason we play D&D is to be heroes. The DM is supposed to present challenges to the players, but also allow them the opportunity to overcome those challenges.
Go Fast, take Chances, and for Tier's sake, Don't Wear a Helmet!