In most cases you will want to sync only the enabled users from AD into SharePoint. There is one extra step needed to do this.
http://support.microsoft.com/kb/827754
BELOW IS A SUMMARY FROM THE LINK
To import user profile information of user accounts that are enabled in Active Directory to SharePoint Server 2010, follow these steps:
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On the Manage Profile Service page, click Configure Synchronization Connections.
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On the Synchronization Connections page, click the Active Directory connection that you want to edit, and then click Edit Connection Filters.
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On the Edit Connection Filters page, follow these steps:
1. In Exclusion Filter for Users, change the Attribute drop-down to userAccountControl.
2. In Exclusion Filter for Users, change the Operator drop-down to Bit on equals.
3. In the Exclusion Filter for Users, select Filter box typeto 2.
4. Click Add.
- Click OK.