Lets compare: Duskblade to other damage procs!
Duskblade: 30-200 Shiv: 60-140 (can crit for 120-280) RFC: 60-140 (Can stack with shiv) Trinity force: 200% of base AD Ludens echo: 100 (+0.1AP) Titanic hydra: 40+10% of your max health Ravenous hydra: 100% of total AD Deadmans plate: 100 Gunblade: 175-253 (+0.3AP) Proto belt: 75-150 (+0.25AP) GLP: 100-200 (+0.2AP)
At level 18 with only the items in question and assuming base AD of 100, AP of 300, and 1800 base health; Dusk blade: 200 Shiv: 280 RFC: 140 Trinity force: 200 Ludens echo: 130 Titanic hydra: 265 Ravenous hydra: 180 Deadmans: 100 Gunblade: 343 Proto belt: 225 GLP: 260
As you can see, every item here either flat out performs dusk blade damage wise (many are more expensive by about 500g too though), is a utility item or is only slightly weaker. The damage part of the item is fine, and stands up to its peers.
The problem is riots war on vision black out passive. So stop whining about dusk blades damage; unless your name is Khazix you only get it up for one use late-game anyway. Its like a bad erection.
range and
crit damage if you buy both