There seems to be stuff missing from the old replay system, where did it go?
Like the changes to the RoTW/Gold/Silver, we made the conscious decision to remove some of the other features we felt made the system too cumbersome and complicated. An example would be the whole filtering system. This is now replaced by the menu system, which makes it far easier to find the major categories of replays. The search system is only gone temporarily, and will return in a future iteration.