I've been trying to drum into people (since what seems like the stone age) the fact that, in the scheme of things, META tags are pretty low priority, but it's like whistling in the wind - nobody ever listens to me.
You should have them, sure, but they rank below page content and WAY below TITLE content as far as relevency goes.
The mentality is "META tags look technical, so they must be of overriding importance". Not true.