If you are planning to install Ex010 and want to avoid manual steps or automatically install the per-requisites then you should consider using the ServerManagerCMD cmdlet and use the appropriate server role related .XML file.

Let say if you want to do a typical installation of a Exchange 2010 then you should use the typical.xml (come with the Ex2010 package)

Now you are ready to proceed with the Exchange 2010 Typical Installation.