... This articles conclusion is rather confusing.
You state that 2x Doran's + Vamp Scepter is a noob trap. I assume you're saying that because of how this used to be the meta in season 2? At the present moment, going a brutalizer just simply doesn't help snowball your lane as much as just getting straight damage does; combine that with the fact that, if you are ahead and get a brutalizer, you lack the bonus health from the doran's as well as lacking any form of sustain.
I mean Draven ADC, and unless I get an early double kill and am able to back and buy a BF sword, I alost always get a vamp scepter and a dorans. Why? 80 health, 20 AD, 5 health return on kill and 10% life steal is simply too good to pass up. Compared to the 25 AD and 10% cdr of the brutalizer, the 5 damage simply isn't worth losing almost every trade, as the enemy adc will simply come back with the aforementioned vamp scepter and will thus then be able to trade, cs and get health back, and then win the next trade.