My $0.02
Google doesn't read the META tags on your pages. To my understanding, at least, Google's page rank system completely ignores META tags. But, keyword stuffing within the META tags could hurt your pages as far as Google is concerned. I would definitely remove these and be sure to replace them with something more relevant as many other search engines do still look at META tags.
Increase the number of related sites that link to you. This is the primary factor in a high ranking page on Google. And be sure to link back to them, too.
As for removing all the crap from your hundreds of pages, Dreamweaver MX has a great multi-line search and replace - that's what I would use.
One final thing - I would be sure to submit your site to all the major search engines once you have finished fixing your META tags. This should help to undo any bans your site may have accumulated.
Good luck.
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