Let's say you have a scooter. Even a young girl can drive one efficiently in a short learning time. And let's say you have a Montesa Trial 500 HP competition motorbike. Have you ever tried one? I did. And I tell you one thing: not even some experience with big road motorbikes (let alone scooters) will help you first with a Trial competition motorbike. Unless you have some experience with motorbike crossing, and a very careful attitude, you're going to get in SERIOUS trouble in your first drive with a powerful Montesa Trial. What I am trying to say is: if you have to go to the grocery store, your scooter is the way to go. If you use a Trial Motorbike to go urban roads, and don't take care, you're likely to cause some accident along the way. Renderers are the same: there are some that do their best with short, easy drives, like the P4 renderer. Some other renderers require time and dedication to be set up properly. Then, they deliver great images. But if you try to run them without giving them the time and attention they require, you're going to get from them images that are even worse than an OpenGL preview.