I dunno I'm only up to nightmare (25% phy resist, 25% reduced leech) but I have two melee chars and its definitely harder. I even have Goldstrike Arch on my zon, which I think is a bit above average for a lvl 57, since I haven't seen anything even close to the dmg since I've started.
The stone skins are a bitch, but you just need a ton of elemental, skip them, or usually I'm in a party with at least a couple others so someone will be able to kill them. The multiple shot lightning enchanted are a real pain in the ass, and they'll smoke just about every character who gets a little lightning lovin. If you had a high lightning resist and lotsa leech and life you might be able to just keep making WW passes if you can leech enough life back.
There's a lot of things that need fixing in the xpac. All the melee chars get screwed with phy resist but sorcs can continue to own. Zons are cheap as hell in PvP, especially with stupid Buriza crap. Necros kinda blow... Act5 is PATHETICALLY easy. All there is is bloody and baal runs and lvl 10 in bloody run nightmare.