11 answers
In the code you have above, you are using inputTextArea. You should be using inputField if you want the default value to be presented. For example
If you need to use inputTextArea then you will need to pre-populate the value of Comments__c in your controller with the default value. You can pull this using the describe methods.<apex:tab label="Comments" name="CommentsTab" id="tabcomments">
<apex:pageBlockSection columns="1" id="CommentsPageBlock">
<apex:inputField value="{!Inspection__c.Comments__c}" id="Comments"/>
</apex:pageBlockSection>
</apex:tab>