Vendetta sucks. Simple as that. Its one of the worst, if not thee worst DPS cooldown in game: its a boring +30% damage, it doesn't aid in your procs, it doesn't aid in resource generation, it doesn't change your rotation, it doesn't even have a neat visual. It's pretty much combat rogue insight, but on a 2 minute timer.
What sort of ability would you like to see replace vendetta?