I'm doing duo-necro with Nikki right now, it's pretty leet. Some places suck, like the maggot lair, but anywhere that's open is ownage.
The thing I like most about it is it doesn't take much input to kill stuff. We just keep as many skellies up as we can, and I curse anything that's really hard. The skellies just go out and own everything in our path.
I'm not too fond of Necro's, but that is just me. Look out for the flayer jungle in hell, it's a bitch with all those little guys running around. I think I'm going to go level up my soon-to-be-non-ladder paladin now.
The most successful 2 man act 1 norm->act 5 hell combo we've had so far is barb/sorc, but duo necro is working really well. Skellies are good up until hell as a solo necro, I do know that much. With 2 necros, one going summon/poison and one going summon/bone, we'll have all of our bases covered for the most part.
Are there any effective characters in hell besides hammerdins or at least any characters that you dont have to have INSANE gear just to kill something in hell. I haven't played in a while but my last 2 main guys were hammerdins.
Pretty much any character can be effective in hell, it just takes a lot longer to kill things. I don't see any reason why any characters WOULDN'T be able to beat the game in hell by themself.