Sumok,
Thanks for the compliment, and I'm glad you liked the article. 
There is an advantage in using acrylics in that you can use oil washes over the acrylic without fear of paint lift. That's the main advantage.
Also--unlike enamels, acrylics don't have to "gas out". It takes enamels a few days or more--sometimes weeks, actually--to "gas out" and properly cure. If you can still smell the smell of an enamel coat, you know it's not done drying yet.
I don't like Rustall because I don't think it's easy enough to manipulate the results. and prefer to simulate rust with the methods I've developed.
As for how to use acrylics, well....you just "use 'em"?! Not sure how you mean your question? Tamiya acrylics are my favorite, but I understand that they may be hard to get right now due to earthquake damage in Japan? Still, you can just thin them and spray them like enamels. You WILL get better results for car models however with lacquers. The finishes are much better; brighter, more durable, and very smooth.