Originally Posted by
Zakon
the challenge is the high APM required to play it. You frequently have to double weave OGCDs and failure to do so results in a substantial loss of DPS as you either *lose* one of the OGCDs or drift your GCD, both of which are really bad. Not hard to do on a target dummy but challenging to do while avoiding mechanics. Especially since Viper is a selfish DPS, so any loss of DPS is a big deal as you don't bring anything else to a party.
It was just this stupid debuff you had to make sure was applied before you did anything major, like spending Rattling Coil charges or going into a Reawaken combo.