TBH, mace stun makes a big difference when taking down healer targets and i felt it big time yesterday. My team (2 MS War, Priest, Mage, myself) went against Sundering(Paladin, Shaman, SHd Priest, Warlock, MS Thunder hammer War) and the abundance of stuns from the Warrior, blackout, and hammer coupled with silence and Spell lock was very noticable (especially with the coordination they used). I would not downplay the proc at all. Oh man the target I wear over my head, it was never this bad on my druid. My team hasnt played a decent team + paladin yet and look forward to more matches with them.

EDIT:

As for the burst, with just barely a little resillence so far I already can tell the difference, especially when I am being beat on while my team goes after their respective team members. I think the burst will always be needed but will not be coming from the main sources of damage as much as planning and operating togerher as a team in tactics. Its hard to tell this early (least in my honest opinion), but I think it will make things interesting.

From a Warlock's POV
(5, 45, 11 - 180 Resilience, 10k HP)

Paladin/Warlock
2v2s - A good 90% of these teams at 2000+ are Rogue + healer. Almost without exception in my Paladin/Warlock team, the fight turns into a mana war. Who will run out first? There are little tricks we've learned to deal with, depending on what sort of healer the Rogue has. Priests love to Mana Burn, etc etc. Worst to easiest has been Priest, Shaman, Paladin, and finally Druids for some reason being easiest. We were up to 2046 last week, but we're finally in the "all Rogue/healer teams" bracket, as we call it. I'm a little disappointed in the gimmick, but whatever. I don't like losing. We're working on some gear changes to make things a bit more bearable.

Paladin/Warrior/Rogue/Mage/Warlock
3v3s - We're using our Paladin as an anchor, with melee & ranged DPS as the 2nd & 3rd, without exception. We tried running a Paladin/Rogue/Warrior team one night and lost 80 rating points. Just too many ways to cripple melee DPS. This team is at 2035 for the week. We encounter all sorts of strategies. Some teams try and kill our Paladin first. Some go for our Warrior or Rogue. People usually try burst, but for the most part, two people just isn't enough to kill any one of us outright.

Very limited play, but some thoughts..
5v5s - I only played 8-10 games in the 5v5 bracket, and it's absolutely a burst-fest. The really high rated teams almost always play with Shaman for BL/Heroism. You combine that with 3 DPS on a non-SL Warlock, and even the best players just die. We have very limited means of escape. Don't even bother playing a Warlock at the highest levels of play without SL. Forget about it. No matter how good your healers are, the better teams will always find a way to destroy Affliction/Destrution 'locks. We've got some very talented PVPers in my guild, and all three of us Warlocks had the same experience without SL. There's just no survivability. We are, without a doubt, the worst class in this arena bracket. Somebody ran the numbers for each BG and came up with something like 10% of 5v5 teams on the front page of each BG have a Warlock on them.

I believe when Blizzard announced the first season they said April 16th is the end of the regular season, and perhaps the "playoffs" follow in the week or two after

Que up more, we get tired of fighting teams for 1-3 point wins and losing 25 when someone is half asleep or LD's (unfortunately we are limited by our warrior's respecs since he is also our MT; we are usually queing starting thursday or friday through sunday, maybe mondays if we want to blow another 100g that week). Unfortunately I was sick/out of town this weekend so you were against our other paladin. On the topic of stuns, there's actually a team in our battlegroup that runs 2 paladins, 2 MS warriors both with deep thunder, and a rogue. The sheer number of stuns is unreal. Snares/purging their freedom + our own bof/bop shuts them down pretty badly, but they can certainly be annoying to fight. Once in a while we have arguements about the axesmithing vs. macesmithing and our general conclusion is usually that axes are cooler and probably better for pve dps warriors, but the mace just destroys it in pvp. Regarding the target over your head, yeah shamans are typically one of the better burst targets. Other good burst targets tend to be hunters, non-SL warlocks, druids, disc or shadow priests (pain sup. is terrible and a joke, hi purge; blessed resil is the best priest pvp talent period with proper gear), non-frost mages, among others. I'm really glad they fixed mass dispel to actually work, since it allows a lot more varied strategies on who and how to burst.