Google and the other major engines are cracking down on what they often refer to as "duplicate content." I like to think of it a bit differently. If you take the time to nurture your pages with good titles, meta keywords, and meta descriptions, you'll reap the benefits. If you decide to publish a multitude of pages with the same titles and meta tags, it's just as dangerous as having the same HTML on every page.
I
highly recommend you cater your meta tags to each page individually. Make them as specific as possible. Please do not make a site about cars and then use the keyword "cars" on every meta tag of every page. Rather, if you make a page about car a/c's (meta key: air conditioning, auto a.c., a/c repair, etc) and a page about radiators (meta key: radiators, radiator repair, etc), and a page about tires (meta key: tires, wheels, rims, spinners, etc)... if you do that and link all those pages back to a front page (meta key: cars, autos, auto repair, car parts, etc), you'll have much better success at your
SEO. Remember, most of the search engines now see your site as a whole. You want your front page to be a broad theme, with each of your pages to be as specific as possible to the various "niches."
A site that does the above is more likely to appear under "cars" in google than a site that has "cars" on every page as a keyword meta tag. Explore and implement your sites' niches.
This is a basic example... hope it helps.