User blog comment:Rapacious/Rapacious's sexy guide to understanding ranged AD builds/@comment-121.88.220.24-20120208130344/@comment-3450702-20120220175524

Let me rephrase: If you're smurfing Yi, you could stack phantom dancers and rape faces. Also, when I started, I used to max E on Ashe and just farm till IE, and completely neglect harassment etc. Lifesteal in general is great for poke/harass and uncoordinated teams, because you can just pick off the enemies 1v1 and survive. However, in a "real" game you will be targeted and you WILL need a team to support you and you probably will have a support to heal you, making the lifesteal LESS useful, not useless mind you, but just less of a priority. So, basically, if you're under level 20, I wouldn't recommend following this too closely, simply because the people you will be fighting will have a different mentality and some other tactics work better in cases like that. Examples: Neglecting survivability is acceptable, since they don't focus you. Neglecting penetration is acceptable, because they rarely get armor. And getting Lifesteal over higher damage is acceptable because it serves as survivability and is worth more if you are able to fight for extended periods of time, such as situations where you are not focused and can just fire at the enemies and take them down 1 by 1.

A bloodthirster+IE+PD+PD can probably 1v1 a TBC+IE+PD+Banshee's enemy, so basically:

tl;dr this guide rocks for level 30s with good teamcomps and reasonable skill level. It's awesome, but not completely accurate for less skilled play.