It doesn't sound good to me, if the name of the hotel is released only after booking is confrimed there is no way to compare rates with other agents for the same hotel before booking is made! I am not saying hotwire can not provide good hotel deals but why do they hide the hotel name until reservation is made?? There can be only one reason: avoid comparison with other hotel booking websites!! With the following you can actually compare hotel rates before it is too late:
http://www.orbitz.com
http://www.deskbell.com
http://www.expedia.com
http://www.booking.com