My son and I are new to the game and finally beat Brigadoon with a Valeros, Sajan combo and had a ton of fun using the suggested card list. Before we start the path though I think we will change the cards up a bit. We had died the first 3 attempts trying to pair Valeros With Ezran (though we came close) and with the druid - got obliterated.
Sometimes it comes down to the roll of the dice, and when and where you encounter cards. I definitely will plan to skip encounters as we play through the adventure if things start going against us as dying and rebuilding the deck we will do our best to avoid, and as someone stated, even losing a scenario can still result in a better chance the next time if you found some good items, blessings, allys, along the way.