6.3 item: Duskblade of Draktharr seriously ?

Duskblade of Draktharr:

BUILD PATHSerrated Dirk + B.F. Sword + 850 gold TOTAL COST3250 gold ATTACK DAMAGE75 BONUS MOVEMENT SPEED5% UNIQUE PASSIVE+10 Armor Penetration UNIQUE PASSIVEBasic attacks on an enemy champion apply Nightfall (120 second cooldown) NIGHTFALLAfter 2 seconds, Nightfall deals physical damage equal to 90 + 25% of the target's missing health. If you get a kill or assist on the target before Nightfall detonates, the cooldown is refunded.

I know its meant for assasins and that assasins had problem dealing whit certain tanks but... am I the only one who see's this item being built by adc ? or a problem whit this item perhaps being too cost effective as it gives good ad, flat armor pen, movespeed( more kite really ?) and a killer passive ? or that it looks like a deathfire grasp for ad which deathfire was removed because it offered too much burst for mages ?

assasins and adcs for the most part shouldnt target tanks so why is this item made ? ( the main problematic tanks being mundo and tamh), instead just fix the last whisper line or improve the armor pen items slightly. tanks for the most part have already lost most of their appeal because of the bruisers/juggernauts as they offer almost as much cc but whit the damage to back it up and decent survival,

I can defenetly see this item being problematic, am I the only one who see's this ?