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Our data center requires biometric hand scans, but I've worked for places that just had an unmanned sign in sheet or which used metallic access cards (which could be stolen or lost or even duplicated). Smaller businesses may have their servers and routers located in closets or small rooms without a lock on the door. So yep, they probably need to rethink their security methods.
The best way to make certain that your data center is secure is to hire professional consultants to perform an SAS 70 audit. In addition to using accepted industry standards to judge the security methods that are in place, it is helpful to have a trained, neutral 3rd-party observe how well your employees are following the guidelines they've been charged to uphold.