Inferno isn't worth it. Drops aren't significantly better for the first few acts, Act 1 Inferno generally drops lvl 55 gear with like 400+- DPS when by then you will hopefully already have an item that deals 800+ (Bought on the auction house, since you wouldn't have actually been able to find one of them in Hell). Act 2 is a HUGE difference with Act 1. Act 1 is do-able, but Act 2 is a brick wall by comparison. (You go from being able to handle most except a few champion packs to being able to hand only a few monsters and nothing else) I have 40k hp, 13k damage, 6k armour, 20 procent block chance, like 40 procent dodge (Not as important as AMPM claims, it's actually kind of broken since it doesn't help vs AoE effects like molten.frozen and all that champion pack bullshit i.e the BIGGEST source of damage), 250 resists and I still end up dying in no time unless I engage, use all skills, then back of and kite until my skills are off cooldown. SUPER BORING gameplay.
Not to mention ranged chars have a HUGE advantage.
Watch this video, it hits the nail on the head
http://www.youtube.com/watch?v=u8CBbeSAjVoIt's no challenge, it's not fun. it's just super retarded and frustrating to play. I pretty much gave up playing my monk in Act 2, CBA goldfarming for weeks on end to buy a marginally better item that will then make my marginally better at progressing some shitty difficulty setting with little to no satisfaction. I certainly won't put up with dying 10+ times just to kill some special mob, and I'm not going to just run past them just so I can boast I've ''beaten'' act 2.
Oh and I have a defensive build, obviously. You'd be stupid to try and to tackle inferno without a defensive build (you're pretty much forced to go with one even, there goes that so called 'build variety' in D3, the endgame is exactly the same as in D2 with 1-2 cookie-cutters for all classes), the majory of my skills are defensive/crowd control. Doesn't mean jack shit since after I cycle through them I still have to break-off and kite until cooldowns are done.
But hey, to each his own I guess, if you have fun playing this ridiculous monstrosity that they call 'endgame difficulty', good for you.