Is it bad form to have a a MiscUtilities class?

Our company keeps a MiscUtilities class that consists solely of public static methods that do often unrelated tasks like converting dates from String to Calendar and writing ArrayLists to files. We refer to it in other classes and find it pretty convenient. However, I've seen that sort of Utilities class derided on TheDailyWTF. I'm just wondering if there's any actual downside to this sort of class, and what the alternatives are.