Someone pointed out earlier in this thread that if one wishes to see all the ads at once, similar to the old system, then just leave the search field blank, and hit "search". Hope that helps.
I preferred having the latest things for sale posted up front, if I'm window shopping its a simple one click to see whats out there, now I have to click each category which takes a lot longer. Secondly, if I'm selling a motherboard, CPU , and RAM now I have to post 3 threads instead of one and maintain 3 threads instead of one. I see the benefits of the new system, but I still prefer the OLD one in lieu of the new one.