Grouping past 2 is pointless in Inferno imo - you just give the mobs more HP, while your damage output stays the same and you have to kite so much that it's hard to get good damage out anyway. It does help to have a partner in the halls of agony in act 1, so you can setup rez chains and try to run through the dungeon (you'll almost certainly have to skip some packs, because crap combos like waller, frozen, mortar, shielding in the middle of those tight corridors is basically unmanageable).
But if you think Act 1 is bad, just wait until Act 2 - it particular sucks on Inferno. Act 1 inferno doesn't really drop decent gear upgrades for Act 2, and it's hugely range/kiter unfriendly. So many of the mobs in the desert and oasis are intrinsically fast and swarm you in packs (and often ignore a slow time bubble completely) and melee hard but not for a single > 35% hit so force armor is frequently useless. Several of them have mortar and the only thing I've found that works against mortar is wave of force. Within the sewers, there are frequently multiple champion packs near each other so kiting is tricky or in some cases impossible.
You can change skills to deal with different affixes, but you'll need to town portal and setup skills in advance - forget about doing it on the fly since the cooldown is too long. I do find I can run signatureless though, since damage is frequently hard to get out consistently.
Also f*** the nagas right after you meet Hakan for the first time on Inferno.
Unless you've gotten really good gear from the AH, you'll probably want Energy Armor + Galvanizing Ward for the heal over Mirrors. The damage goes up significantly from Nightmare. To make room for an Armor skill, I'd take Blizzard with Frozen Solid, and sacrifice Frost Nova - you might want it on a few boss fights if you use it to interrupt a cast, but in general you wont as long as you drop Blizzard. I prefer Electrocute with the chain lightning glyph since you can chain it off screen and its great for packs slowed in your blizzard. You'll also find you need to do more damage quickly, so I'd take Magic Weapon with Force Weapon.
But if you think Act 1 is bad, just wait until Act 2 - it particular sucks on Inferno. Act 1 inferno doesn't really drop decent gear upgrades for Act 2, and it's hugely range/kiter unfriendly. So many of the mobs in the desert and oasis are intrinsically fast and swarm you in packs (and often ignore a slow time bubble completely) and melee hard but not for a single > 35% hit so force armor is frequently useless. Several of them have mortar and the only thing I've found that works against mortar is wave of force. Within the sewers, there are frequently multiple champion packs near each other so kiting is tricky or in some cases impossible.
You can change skills to deal with different affixes, but you'll need to town portal and setup skills in advance - forget about doing it on the fly since the cooldown is too long. I do find I can run signatureless though, since damage is frequently hard to get out consistently.
Also f*** the nagas right after you meet Hakan for the first time on Inferno.
http://us.battle.net...lXSO!YfW!abZaZY
Until you get Force Armor, you'll probably want Ice Armor with the Ice Reflect glyph for more novas.