A80 Controller voiced concern regarding RNAV STAR procedures; alleging flight crews have questioned; and not always complied with altitude/speed restrictions; adding; separation issues have resulted because of the uncertainty.

Narrative

RNAV STAR's into ATL continue to show the altitude restrictions and speed restrictions on the plates; causing much confusion and lack of understanding by the pilots. In this incident; the CRJ2 and CRJ7 were supposed to slow to 210 KTS at a specified point and did not; therefore closing the lateral separation requirements. One aircraft had to be stopped at an altitude above the proceeding aircraft to ensure separation. This is a continuing problem that has been going on for over a year now. There is absolutely no excuse for these charts not to have been changed by now. This is an everyday occurrence at ATL and has already led to one operational error.Callback conversation with reporter revealed the following information: The reporter indicated that some flight crews are complying with the subject speed and altitude restrictions and some are not; making controller separation decisions difficult. The reporter surmised that some of the confusion may have resulted from the fact that the initial start up of the ATL RNAV procedures had to be canceled and restarted sometime later because of separation issues.