You can give the tags any styling you want simply by using the styling options in your editor.

For instance, you can make the title a Heading 3 by selecting the [title] tag and choosing Heading 3 in your editors styles.

So something like this can be done:

{article title="My Article"}
[title]
[introtext]
[readmore]{/article}

My Article

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.