Reflection on the author...
Comments, while not used by the compiler, are written by the same person who writes the code. In general, one reflects upon the other. If you see "bad (sloppy) comments", there is (I suspect) a similar fate for the code in general.
So, if you see bad code (and that is everywhere!), bad comments are not far behind. So, cleaning up comments to reflect the code in general is probably a "good idea".
Bad, or incorrect comments are worse than no comments at all. Documentation is something that needs to be done.