I have 30k dps.. But it all doesn't matter.. Because wizard are so weak they literally just die in 1 hit.. Pointless in inferno to be honest.. I have wasted my time with wizard, to be honest if you want good offense it will be demon hunter, if you want good defense it will be baba or monk.. So what is left of a wizard? Nothing. She runs slower than any other character.. The teleport lose to dh and baba sprint.. So all in all, wizard lose out in almost every category
Not really. When I first got to inferno I thought it was just going to be impossible to even beat Act 1. Of course I wasn't ready for it just like everybody else. So just like everybody else I got better gears and upped DPS first then got some HP and resist.
After farming Skeleton King for a while I got enough gears to kill Butcher. Once I got used to that I started farming Butcher.(Not much. I think I had 26k HP, 300 resist, 27k DPS with force weapon) Then I got to Act 2, it was too difficult of course, I couldn't even get out of town to do the first quest because I would just get one shotted and didn't even know what hit me. I went back to farming Butcher until I got enough gear and managed to clear Act 2.
When I got to Act 3(with friends' help) it was even worse... Even a skeleton archer one shotted me... Everything that hit me one shotted me, through the force shield AND diamond skin. So what did I do? Went back to farming Butcher... By the time I got tired of it I had 39k dps(with force weapon) 33k HP and 420~480 resist.(which is what I have now) Now nothing really one shots me with force shield up (excluding obvious big ones that will one shot pretty much everyone).
Now I farm Siegebreaker... I die a lot and one run takes an hour or more. It's tough but I can do it.
I'm really satisfied with the overall experience... I've progressed over time steadily and significantly. And I think this is what Diablo is all about... When it's too difficult you farm and gear up and try again. A lot of people seems to be annoyed by AH but AH made it really easy for me to trade stuff that I don't use and get what I want.
First time I got to Act 1 I couldn't clear 70% of elite packs that I encountered. Now I can pretty much clear every pack I encounter in Act 1, including invulnerable minions. Here I am at Act 3, killing soul rippers without dying(white mobs of course) and clearing maybe 80% of elite packs I encounter, even though it may take a while.
I can't even imagine playing a melee class without godly gears so that's probably not even an option for you.
While Demon Hunter does really good damage it doesn't have damage reduction skills like the force shield.. So it's more costly to gear up for the resist and vit if you don't want to get one shotted. Of course it'll be easier to avoid any hits if you play DH.
Not sure about Witch Doctor... Don't know much about it... But a friend of mine has a WD and has 5k HP in inferno because he gave up all vit because he was getting one shotted anyway and went full glass cannon.
So no matter which class, inferno is going to be difficult and you will have to grind for gears. You can do it.. You just need better gears. (lol)