I've been playing as the Overlord in a two-player campaign where my friend controls two heroes simultaneously, Grisban (berzerker build) and Leoric (Necro build). After doing pretty well with this combination early in Act I, things started to seem more and more hopeless as we got closer to the Interlude, and the beginning of Act II seemed borderline impossible.
I guess I'm interested to hear if anyone else has any experience playing this type of two-player campaign with no heroes capable of healing, and what kind of success they've had.
For the record, we skipped First Blood and just started everybody off with one XP. We then played Death On The Wing, Castle Daerion, and The Cardinal's Plight, as well as What's Yours Is Mine from the first expansion pack. I don't have the campaign sheet in front of me (I'm at work on luch atm), but I believe the heroes won Castle Daerion and Death On The Wing and I won The Cardinal's Plight and What's Yours Is Mine.
I smoked him in the interlude, basically going easy on him a bit to try and see if he would be able to pull it off, but with my constant respawns and his rather slow movement, he was just continually running into fresh reinforcements and gradually getting ground down until the point where I couldn't justify holding back any more and just went ahead and won the map.
We started Act II with The Dawnblade and the only way he was able to win was to get to Arcite's tomb and die there and just wait until the turn right before the ray of sunlight moved on to it to stand up. I'm not even sure if this is a legal strategy. I couldn't find anything clear in the rules about whether you have to stand up in your very next turn, or if you can elect to stay knocked down as long as you want.
At that point we buckled and decided to add a cleric and he did lose the second encounter, but only really due to a total lucky draw on my part (Dark Charm FTW!).
Just realized lunch was over 22 minutes ago, so I'll have to check back on this later. Work to do.