Please enlighten me, where do we need berserkers at the moment? There is supposed to be a balance in each perk so everyone has a major role in different occasions. Like
Medic: heal teammates
Commando: kill the smaller enemies such as crawlers, clots and especially stalkers. Also can warn the team when invisible boss it near.
What about zerker? Now the update came and nerfed zerker, they just run around taking damage because even gorefasts won't fall anymore when decapitating them with a chainsaw. Not to mention FF servers, they are just running in everyone's line of fire. They have no major role in any occasion. Sharpshooter took his role, SS took everyone's role to be honest.
If I recall correctly, since the Katana came out, there weren't a great deal of people running around with the Chainsaw anyway. Yes, the Chainsaw has been screwed, but you applied the "useless" notion to Berserkers in general, when infact, a Berserker with Katana can still fill his role absolutely fine. A Berserker with Katana can still do everything it could before the update, it just isn't a simple as holding Fire and turning your mouse anymore. Ofcourse some of this(FPs) is due, in no small part, to the Crossbow being pretty overpowered(I'm not, by any means, saying that the Katana is useless without Crossbow.. except when it comes to FPs).
I honestly don't understand all these people complaining that the Berserker is useless. So I'll try to enlighten you somewhat: The Berserker + Katana combination mainly included the use of the Crossbow pre-patch, and now, it seems like one of the best combos available. Whilst not as "good"(for lack of a better word) as the SharpShooter, the Berserker doesn't require a long ranged weapon, so the addition of the Crossbow was simply for leisure, as it is now somewhat, but it's also now the Berserkers key to taking down Fleshpounds. Unlike the other classes(with exception to medic), the Crossbow is easily combined without any need for removing the Berserker's main, class-specific, weaponry. It is a simple little addition that has absolutely no downside for the Berserker class, and seems to be the best way to kill Fleshpounds(which doesn't change when in the hands of a Berserker). It also makes taking out Sirens/Husks/Groups/Crawlers just as easy as any of the ranged classes(if not easier).
So it would seem to me asthough Berserkers are still as capable at dealing with every mob as they were before, plus, they are now one of the most capable classes when it comes to Fleshpounds. They just can't sit back at a very, very safe distance and drop anything in a couple hits like the SharpShooter(... unless they use the Crossbow).
Yes, the SharpShooter can do anything better than any class in the game, but when compared to the other classes, the Berserker still shines. Incase you haven't put all these abilities together, it means that the Berserker is just as good a solo class(atleast) as it has ever been, it's just that now, it's one of the better classes when it comes down to FPs.. and it's still one of the best at dealing with Scrakes. Forget "major roles" for now, because the simple fact is that SharpShooter owns them all(although Berserker can still fill them).