User blog comment:The5lacker/Varus is not a normal AD carry/@comment-6006137-20130612211839/@comment-5266525-20130612224214

"Riddle me this: Why would you play AD Varus? You aren't going to get use out of...50% of his kit, more or less. The Blight damage and procs, procling blight from his E, the damage from his Ult, etc. Unlike other champs with castable AS steroids, Varus ends up poorly synergizing with crit chance and really doesn't benefit much from AD because, again, he has all of one ability with halfway decent AD scaling."

If you think Varus is bad, god help you if you ever look upon Tristana or Kog'Maw. :/

You pick Varus when you need a carry who either has AoE CC and can wreck health stackers. Your biggest problem is assuming that not building AP automatically makes any AP-scaling ability useless, when it couldn't be farther from the truth. Even disregarding their damage Varus has excellent utility for a carry which is going to be there no matter what they scale on.

"Varus is one of the few that can actually benefit from a bit of hybridization, namely Hextech Gunblade and Guinsoo's Rageblade, both of which synergize with his playstyle and grant him impressive sustained damage..."

Hybrid Varus' sustained damage is awful compared to AD Varus and its burst damage is awful compared to AP Varus. There is no reason to go hybrid whatsoever other than as a joke.

He isn't even a horrible duelist like you insist he is. Not the best, but he will beat carries without significant steroids like Ashe, Caitlyn and Quinn because his Blight detonations can function as pseudo steroids (at least in short fights before he blows all of his cooldowns).