1: While they should have had some kind of notice or warning before queueing for PvP since this didn't align to something like a major expansion release, this is patch was a major PvP patch so they probably assumed most people expected that. Especially when all of the job guides were re-done for PvP. This is also pretty normal whenever abilities go through major revisions in-game.

2: I agree, this sucks. Especially when you're with a DNC or SGE who isn't assigning a partner. Admittedly, I would probably get my account banned in some games with the people I get matched with though.

3: It definitely needs some balancing and adjustments, but I really don't understand why people keep thinking they need a healer on their team. If I'm on SGE I can't heal at all, only some shields every 15-30 seconds. The other three healers can basically only heal once every 15-30 seconds but with heals that don't really exceed 15k (even that is really only from Macrocosmos if you get lucky and can pull off one that seeds a ton of damage without people dying). Having a RDM or SMN is going to be a way bigger game changer as they do way more damage and can still heal their teams. Having a tank is a bigger game changer because you can soak so much damage. Don't get me wrong, I'm having a ton of fun with healing in PvP, but that's because I'm not really healing anymore. In my own experience being a healer, most of the games I've lost are to teams without a healer and 2 tanks + either a RDM or SMN.

4: PvP has always been dumbed down ever since they moved away from using the exact same PvE abilities, and effects, and skill customization. Every job has some sort of CC now, DRK's is access denial via DoT and with a bind through their targeted ground AoE, Salted Earth. The problem now, at least for me, is the fact that EVERY job has CC. I feel like I am always stunned or bound or silenced, even if I try to time my Purify correctly. Maybe this is just because I am a healer so I am targeted but it's really frustrating (especially with WAR being able to AoE stun).