So in this scenario you will have around 70%life steal, and a decent movement speed of 460, despite thinking that this is some noob build it can actually be very overpowered as long as you use can play good with Warwick. The sequence of building is
1. Doran's Shield
2. Buying The Hextech Gunblade but first of all buy the Bigewater Cutlass
3. Boots of Swiftness
4. Bloodthirster
5. Stark's Fervor
6. Phantom Dancer
7. sell the Shield and then buy Spirit Vasage

Then at this point you should be able to drain without using any abilities a hero of around 2500 health in less than 5 second to half of his health than using the ultimate and the first ability should finish him off. But everything is according to the players choice of combat style..