Call them Dreadnoughts. Call them Helbrutes. Either way, they just got better in the new codex.
Reason 1 they're better: they are not automatically crazed -- only when hit by enemies.
Reason 2 they're better: their fire frenzy targets enemies, not friends.
My base set-up (pictured) with a plasma cannon got 5 points more expensive, but given the changes to crazed, I think its an improvement.
Here's a few set-ups that might become common:
Helbrute with pair of Thunder Hammers (110 points)
Race toward enemy lines (or drop-pod in via a Dreadclaw) and hammer away.
Helbrute with Power Scourge and Reaper Autocannon (115 points)
Cute, all-round dreadnought.
Helbrute with Powerfist containing in-built Heavy Flamer, Twin-Linked Lascannon (140 points)
I like this set-up. He shoots from the opening at opportune targets as he advances toward more squishy enemies. Target transports, pop them open and engage the contents. Possible even better than the equivalent points of terminators? Hmmmm - now there's a math-hammer conundrum. (answers welcome).
Helbrute with Missile Launcher and Plasma Cannon (120 points)
For support purposes. Sit on the back lines and shoot volleys of templates at the enemy, plus the odd krak missile. Probably better to think about an obliterator or two instead for support to be fair though.
So overall, I like them, but they are competing with other elite slots. I'd be tempted to take several if I was going to take them unless its my Nurgle dreadnought (which I just like the sculpt and paint job of -- see image).