There are lots of complaints about the site but not all of it is very constructive. I believe that the site needed to change at least at the backend to deal with the demand on the site, however I don't feel the site works as well as it could, but that doesn't mean it can't be at least as good if not better than the old site. All that is needed is constructive feed back to help improve the site.
The Navigation: I noticed that the Admin has had to explain how to use it to people, which shows straight away that it is not doing it's job correctly as navigation should always be intuitive unless only being used by advance and experience users.
First the nav writing is too small and looks cramped especially in comparison to the third level of navigation.
Second a second level of navigation is usually a sub nav of the primary so under sweets you would find chocolate, candy, toffee. not a independent navigation.
Thirds there are 3 navigations on top of each other. 2 would be fine using the above style but if you need a third try and use the left or right of the screen to avoid confusion.
Fourth: the forum navigation . If you look on topics with 10's of pages you will notice that all the following number like 23 24 25 are all joined together such as 232425, this is even worse with really long topics.
Fifth, the look and feel of the forums feels alien to standard convention of forums. Whilst this in the longer terms could be a benefit as it could make the forums easier to use, but right now it leads to a lot of confusion and uncertainty about how to post and whether you are posting into the right area.
Ok that is it for now. Once I have time I will look for some positives of the site, which are often not as easy to spot as negatives. The only question I have for the Admin is to wonder if usability testing was done for example did you give a task (find newly publish deals) to new users (who have never used the old site) to see how easy they found it and also the same for users that were use to the old site? The reason I ask is that some of the issues that I have seen would normally come out of those types of usability sessions.
After all that I hope the team that built the site won't get disheartened with the comments and instead see that it just means people care about the site and want it to work well.