Currently the ILEC is not obliged to condition voice lines in case they are of insufficient quality (load coils, bridge taps, moisture in the line, cross talk etc), to support CLEC ADSL.
This means that the loop (line) success rate of line sharing installs may actually be lower than dedicated line installs.
In the former case, you, the customer, are stuck with the quality of the copper you already have to the CO. It is unlikely the CLEC can convince the ILEC to improve that line.
In the latter case (non line-sharing installs), the line is required to be of data quality to start with, thus the CLEC can request the ILEC fix many problems in order to get you installed.

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