We're doing 1 quest a week at the game shop right now; next weekend we'll do Interlude 2 and we're loving 2E. We played 1E for a long time and it was such a backwards game. The heroes were rewarded for racing as fast as they could, blindly grabbing treasure BEFORE fighting monsters, and abusing the crap out of fatigue. Defense was god and got to be so broken that the OL had almost no chance to harm the heroes without carefully orchestrating nuclear strikes on a single hero--who then returns with full life & fatigue at the next checkpoint.
Now defense isn't the end-all-be-all. Getting separated and knocked out is very risky. Timing your push to the objective for the right conditions is critical. The warlord doesn't have the most mind-numbing job in existence anymore. Fatigue is still amazing, but being used for skills too, and potions being rarer keeps it from being overpowered now. Separate objectives creates a challenging stuggle to hinder your opponent while progressing your own goals.
If I wasn't clear enough, I love 2E. And the conversion kit is awesome-sauce on top of that.
I kept a campaign journal of our 1E games and I was reading it the other day. 90% of the entries were, "The scout dashed through and grabbed everything. They fatigued up and battled to kill off every monster I had. I managed to pull off a spawn + trap + rage to barely kill off the weakest hero. They waited at the door for me to finish my deck before going down." It was all numbers and there was almost no choices to be made.