They have been recruiting recently for a reviewer.
My guess is that it takes someone very special who is not just an expert is design and development but also has a keen business sense and vast experience and knowledge of the marketplace itself.
For what it is worth the delay is not especially about the number of reviewers only. It is heavily influenced by the hundreds of submissions they must get a week and the large % of rubbish that they have to at least look at which takes time. Also faster reviews mean les exposure on the homepage which will cause more complaints. It is a catch 22 and I believe they do a great job as it is.
Design wise it would take a long time to mark everything but start with the basics by fixing typography and addressing this http://validator.w3.org/check?uri=http%3A%2F%2Fiboxbd.com%2Floon%2F&charset=%28detect+automatically%29&doctype=Inline&group=0&user-agent=W3C_Validator%2F1.3+http%3A%2F%2Fvalidator.w3.org%2Fservices\