Wow ..... Feels like I got punched in the gut reading the dev's answer. He's basically saying, "Darkness good, Madness good, Deception ****** in Pvp and that's how we designed it."
My main WAS deception spec Sin and I was pretty damned good with it. I didn't expect to jump in the middle of the fray and survive long, much less win. I ran around the edges, harassed healers, and was very helpful to the team. Now I bring our team down if I run my sin so I had to retire him for now.
The problem with Deception as I see it is that it takes too long to build up to its burst potential. Static charges are SLOOOOOOOOOOWWW to build up and they die too fast before they get off a good hit and can run and hide as designed. Now, pre 1.3 this was easily worked around with adrenals and relics which allowed us to either front load our burst early (esp in 0/30/11 death spec I ran as the voltaic slash is basically worthless). Now that burst from external sources has been removed, some small changes could be made imo to make them back to the glass cannon they were before.
Voltaic Slash - give 15% chance to crit discharge (can stack twice for 30%) rather than bonus to crit damage on shock.
Maul - move it further up in the tree and have it auto crit instead of armor pen (keeps it out of tankasins hands).
Static Charges - need to build up faster if talented like Arsenal's heat signature can. or just 2 charges needed.
I don't like to play Tankasin but that's THE best for PvP now with auto crit on shock so often they stack power augments. Some are hitting in ranked now for 4k shocks with a 2k chain shock when it procs an dit builds up super fast. I said I can't beat the OP FoTM so rolled pyro powertech and feel so dirty for doing so. I just want my deception sin back that was tough to play but useful