Absolutely. Flimsy pages will have a hard time ranking, and if all pages on your site consists of all flimsy pages you'll get hit by panda and even if you aren't hit by panda, high competition keywords will be difficult to rank for with weak content.

Anything less than 250 words is flimsy IMO. Don't write for SEO if you care about the user and conversions, don't over optimize and be sure to use similar phrases and industry words so that Google can tell that your site really is about that keyword and not just an article with that keyword thrown in for SEO.