How do you use Tildes' labels?

One of the unique feature of Tildes when it comes to content moderation is the usage of "labels". While there are guidelines, there are no hard and fast rules as to when to use one label or the other (nor should there be!). I am curious what criteria you all use when deciding whether or not to apply a label to a comment, and also how frequently you find yourself labeling things. For reference, the current labels are:

• Exemplary
• Offtopic
• Joke
• Noise
• Malice

Are there labels you find yourself using more than others? Are there some you think are unclear? I feel like this is an often overlooked and underused feature, but that may just be because I personally do not use them that frequently. For example, I have only given a few Exemplary tags, a few noise, and I don't think any of the others.