Viper is a really funny class. You can play half asleep as the rotation is mostly predetermined. The result is a job that simply mixes in at the top without any great understanding of the class.

In my opinion, the job and the Picto could do with a nerf.
The existence of the Viper just contradicts everything, why you should play a job that is more complex and possibly more difficult to play when you can simply hammer on the highlighted buttons with your head.