The obstructed view cabins are behind the lifeboats. Exactly how obstructed the view will vary based on the alignment between the window and the lifeboat. If you are across from the top part where the pilot sits you won't have much of a view. If you happen to be between two lifeboats you would have a better view.
A Bad Day At Sea [with power] Always Beats A Good Day At Work
Alaska 2014 - haven't picked a cruise yet
Carnival: Glory 2004, Destiny 2008, Splendor 2009, Freedom 2011, Valor 2012, Dream 2013
Celebrity: Summit 2011
Princess: Ruby 2010, Caribbean 2013