Just got Mists of Zanaga and played a four player game of it. I LOVE this big box expansion!
I won't go into too much depth here because I don't remember most of the specific names.
We pulled Mists of Zanaga out of the box and quickly read the rules. We had a few problems with rules specifics but had most of it cleared up by the end. I managed to steal the win and defeat the Alligator Guy whose name I don't remember.
Pros:
Rituals created more character interaction as we discussed which rituals and rites to complete. Some of them completely changed the game when they were in effect. This kept the game very dynamic. You could end up taking damage or fighting monsters or doing a number of things during other players turns. Once the primal god was chosen rituals could have two effects. Lots of them BAD! No dull moments in this one!
Roaming monsters rock! It was pretty easy to fight a monster every turn and you could often choose which one by going to the right terrain. It was rare that someone didn't face a monster during a turn. Also the monsters were pretty tough once we hit blue and red. We had a few knockouts.
Villages/Trading posts replace the cities and add new market options. Its now possible to do a market step and fight a monster in one turn. Also the standardized survival gear makes game play easier. I could see adding some sort of healing potion to the available gear.
I think this expansion has lots of replay value. The goal of the game is to defeat the awakened Primal God. There are at least 8 I think. Maybe more? Either way each one seemed to require a different approach and had different effects during game play. LOTS of variations possible. I don't see this one getting boring for a while. Except...
CONS:
This game uses its own adventure decks. They are nice sized decks but the backs are different than standard runebound AND the monsters all have terrain symbols on them for determining their location for roaming monster checks. If you want to port over other monsters you would have to find a way to give them a terrain type.
That's the only con I have! I can't recommend this big box enough!