Not having an agenda is one thing. Not having an idea about what the meeting's result should be is another. While the former is still unfortunate, it can easil

Not having an agenda is one thing. Not having an idea about what the meeting's result should be is another. While the former is still unfortunate, it can easily be taken care of within the meeting collaboratively. The latter is harder to come up with in an ad-hoc fashion, but it's still possible. I agree that in an optimal world, every meeting is planned appropriately beforehand and meetings that aren't necessary do not exist. In reality, that's not the case. So you have to deal with that. Just complaining will not help.