I'm tossing my 2c on the floor. If anyone wants to pick it up, feel free.
Zerks, imho, take a different sort of mindset to play than most classes. With any other class in the game, if you screw up, you flee (provided you aren't lag locked) and run away to try again. Now take zerks. Once you are in combat, you are pretty much in combat. Unless you take the weak path, which is like a warrior with sucksauce dribbled liberally over it. Zerks take a "balls to the wall" kind of mindset to play, because if you screw up, then thats that. Good game, slap your cabal mates on the rump and go reequip. Add to this the fact that reequiping as a zerk is about one notch down from reequiping a voker, and there is your problem. You got a class that is all about tossing all your chips down and praying to your god/goddess/uncle tom, and one that is one of the hardest to reequip. This; I would think, and judging by the player base here I am right; is why zerks have always been unpopular and considered weak. Meh. Or I could be smoking the peace pipe again, ya never know.
I think zerks are wayyyy harder to re-equip than invokers, unless you're counting the time it takes to mana charge. Invokers don't need gear, berserkers need it like crazy, and they can't PK or solo anything while naked. My invoker re-equipping consisted of me killing somebody in brass and a power staff.
Lets get something straight - you cannot open with weapon or shield cleave even after the current changes. You can open with haymaker and roar has been changed.
Berserkers are a class that I have found to require an almost purely offensive mindset. There is no place for half measures, pussy footers or might-doers. If you want to be a sucessful berserker in almost all cases you need to be thinking about how to maximise your damage output into your opponent. This requires more than a set of shiny hit/dam eq and a few nice weapons. Anything less will see you getting beat up time and again.
The good news is that if you can work it out you can be a real force to be reckoned with.
Personally, I believe beserkers are a bit on the weak side of things - mainly because they really cop a hiding vs melee and most hybrid classes and don't overly dominate mages and communers.
L-A