VS HTML editor in Beta 2 sports a small new feature: automatic formatting of HTML on paste. By default it is off, but you can activate it in Tools | Options | Text Editor | HTML | Miscellaneous | Format HTML On Paste. Activating the feature makes editor automatcally format snippet and indent it relatively to its parent.

For example, when I paste HTML comment and A element in a table cell:

<table> 
     <tr> 
          <td> 
<!-- Format HTML on paste OFF --> 
<a href="www.microsoft.com"></a> 
          </td> 
          <td> 
               <!-- Format HTML on paste ON --> 
               <a href="www.microsoft.com"></a> 
          </td>
     </tr> 
</table>

Give the feature a try, you may like it :-)