Everyone's free to do what he wants, of course, but I'm arguing that there are strong advantages in making good commits.
Ok, good is subjective, I guess, so let's say commits with good descriptions, all the information that could be useful to understand what they do (and where appropriate, why), and a limited and coherent amount of modifications in each; in short, commits that are easy to follow and will provide what you need to know if you come back to them later.