Very, very short guide and not with a lot of explanations, clearly you didn't put in too much work. However, if people like it(u already have better score than my guide) it's ok. Regarding your concept, I have to say that my creed is that Shyvana should never be played something else than off-tank. Still, if you tried this thing and it worked for you than that means your a good player, as you avoided melting in team-fights. Kudos for that.

What I want to say is that, since you like to crit and have big ATS(like the other melee carries), why do you buy Wriggle's Lantern and Bloodthirster? You don't need that much life-steal, as it's only as good as the damage your doing. You already have Phantom Dancer and Atma's Impaler, why not and Infinity Edge too? A 75% critical strike chance is hard to pas up, that way you'll crit like Master Yi or Tryndamere, every time. Not to mention that 250% critical strike damage means you kill anyone very quickly. That will do much more for you than Bloodthirster.

Of course, you do need life-steal and where do you get it? From another item, of course, but not silly old Wriggle's Lantern, something to make you attack even faster, Zeke's Harbinger, the pride and joy of any self-respecting melee carry. You say ATS is very important for Shyvana, yet all you buy her is Phantom Dancer and Berserker's Greaves. Zeke's Harbinger is the real ****. Plus, it helps your team too.

On last thing, please use the masteries that exist in the game now, not the old, out-dated ones...