Just played it twice and RtM rocks! Its like Rhosgobel, Carrock and Anduin combined - you need Firepower, Healing and Questpower. The treacheries are the nastiest seen so far in the whole cycle. There are four quest stages and you have just like 10 turns time at max and you have to clear the staging area from enemies at the end in order to win.
The only drawback is that RtM is very luck dependent: if you draw only small locations/enemies from wilderlands and passage through mirkwood encounter sets, its not that difficult. If you happen to draw too many RtM-Cards and/or big enemies from wilderlands you're dead in no time.