Thanks, everyone, for the kind words.
Agreed, Baumi. But from the playtest, Healing Surges certainly do mitigate that somewhat. And don't ignore the defense bonus you get from Second Wind, it's a life saver (It certainly was in the playtest!).
The Wizard was definitely over her head in those last two fights, I really did feel like the next dice I rolled could have been a kill. Next time, I'm not going to use monsters quite so tough. 2 things allowed her to survive: smart thinking and a good dose of luck.
The encouraging thing that I got from the playtest is that being smart and using all available resources it a big part of the game. On the other hand, the new system might be fast to prepare but DMs are going to have to re-learn the art of eyeballing a bit.
One thing I did notice is that the modifiers given next to the ability scores for monsters are all over the place for no apparent reason. Really wierd.