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Welcome to the new world of Personalized Search ;-)
My sense is that the call to action style is pretty old school and it's too close to offline marketing for many search users. I think it often gets tuned out - sort of an analog to banner blindness.
When the old "3-click rule" was discredited in actual user testing, the discovery made was that people would keep clicking into a site, up to 15 times or more, IF the information scent was strong enough.
Here are some related articles:
Deceivingly Strong Information Scent Costs Sales [useit.com]
[edited by: tedster at 6:46 pm (utc) on Jan. 14, 2010]
joined:Feb 28, 2004
Almost every serp for our sites display a part of the tag. I would think that if you do not include a description tag, you are not giving possible visitors to your site enough info to decide if they want to click through to your site. This I believe may cause your site to not rank as well due to lower click-through rates.