Seems like alot of the tanker changes, burn in particular, are geared towards preventing mass herding and PLing. Instead of decreasing the effectiveness of certain tanker powers, why not concentrate on improving villian AI to prevent mass herding and fixing all known PLing missions like Chimera and Dreck.
I think most of your paying customers will agree with me that we would like you stop with all these nerfs to balance the game to be working "as intended". Further, I think people will agree with me that instead of nerfing strong powers, bring up the weaker (less used) powers to balance the ATs. If you want to make this game more challenging and fun (ie required to team and with a defender) then improve villian AI and make them more challenging. Here's an idea, make minions=Lts, Lts=Bosses, Bosses=AVs, I bet that will make it more challenging without nerfing powers plus people will want to team, espcially with a defender.
Devs, try to remember why people bought this game and have been loyal for the past year. What has made this game the MMOG of the year? Don't lose sight of what made this game popular with gamers, even it it was not "working as intended".