Once upon a time, a dot info was considered to be a cheapskate extension. That's basically because the dot info extension was new and domain registrars offered it at a ridiculously low price.
Now, the situation has changed. Dot info is a legitimate extension, just like dot com. In certain situations, a dot info would make more sense. For example, if the site is purely a knowledge database, then a dot info fits right into the theme. Like, say, cats dot info would be perfect for a site which simply contains information about cats.