Is your reading comprehension off ?
The discussion is offhealing, all I've stated that shadow offhealing is PURE trash, which it is. You go oom after a few flash heals that don't heal for higher than 7% of someone's HP bar, while at the same time someone elses passive healing ticks for free at a certain percentage, etc. Elemental Shamans are probably the best example of decently balanced offhealing in the game right now, they heal for a relatively decent amount and go oom in the process, everything else is either overtuned or undertuned ( spriests heal for jack shit and go oom in a second, while Enhs heal as much as fucking disc priests do rofl ).
The discussion wasn't about Shatter or Shadowpriest damage/abilities, it was about hybrids and their offhealing. You'd have to be blind not to notice Shatter is doing very well on ladder right now.
Also this is the problem with arena community, you people are like fucking wannabe lawyers, everything needs to be mentioned and spelled out and reasoned out 99% of time, otherwise someone will always come in like this guy did and go all like :
"man, I really dislike the fact that I'm forced into combat to be able to compete with other teams, the spec is clunky, boring, I want to play sub" - 6.1 rogue with a brain
"OMFG U R FUCKING MOST OP SPEC IN THE GAME SHUT THE FUCK UP NI***R" - arena community
"I know that, I simply stated what I don't like ? ..." - 6.1 rogue with a brain
"OMFG SHUT THE FUCK UP IDIOT GO BACK WHERE U CAME FROM HOW DARE U OPEN UR MOUTH" - arena community
Ya, that'd be a sick burn if the guy you were quoting wasn't wrong in the first place, making you an even bigger moron.