^^^ Yup. Unless you're racing/riding SS, or FG cross it's useless (and screams poser ******bag). ^^^
Bash guards are used on mountain bikes in rocky, or wooded areas so your chainring doesn't get "bashed" on rocks, or at log crossings. If you're in those areas on a bike with 700c tires... you're either stupid, or John Tomac.
Description of a chain guard.
http://cyclocrossworld.stores.yahoo....ealchgufo.html