If you go to the tutorial links in the heading of the website Brad has a lot of great tutorials that will teach you how to get everything nice in RetroArch. I use quiet a few standalone's when they are necessary (Atari 5200, Sega Model 2 & 3, MAME, PS1, PS2, Colecovision, Gamecube and Wii) but wish most of them had RetroArch cores.