Anyone currently playing this, or tried to play, solo, without using alternate variant rules or at least a bare minimum of them? How is it?
I think it works with minimal adjustments. The two potential problems are:
1. Secret missions for Heroes & Sauron
2. Playing combat cards simultaneously
When preparing for our first real game I made several solo test runs. If you concentrate on trying to make the optimal choice based on the information available to one side, you're mostly fine. You're missing out on any possibility to bluff, naturally.
To deal with problem #1 I've seen an interesting solution: Draw two missions for each of both sides and only look at them after the game is finished.
To deal with problem #2 you could draw cards randomly for one side, alternating sides until one side is exhausted or defeated.