We had done some work on a 5.3 install package with ORCA. What we had found is that you can come really close to a silent install, but for some reason, there were just some MSI properties that we couldn't get to stick, no matter what we tried (specifically related to print composer installs and PE services being on by default). Our 5.3 install still requires about 3 clickthroughs and setting the print composer option by hand.
I began browsing the documentation for the Editor Deployment Kit. There may be some added value there, but I still miss the 5.1 and prior method (the patch dir and the text config file made things waaay easier, IMHO).
I wish there was still a method for adding a skeleton install tree with the files you wanted as part of the install.