Agreed absolutely that you should use the right tool for the job. Know the limits of each tool, and don't engage in blind advocacy.

Besides which people tend to pay more attention to your advocacy when you have demonstrated that you try to offer what you consider the best answer in all situations.

As for VB, here are its advantages in my opinion. It is quite good for building quick and dirty GUI interfaces to use on Windows, and Microsoft's integration of it with their line of products, which are widely used. I don't like it as a language, but when the problem fits I reach for VB, not Perl. (OTOH I angle things so that the problem does not often fit...)