I think WoTC seriously underestimated low level characters damage output. At level 3 almost every class can deal huge amounts of damage per turn, even if limited to a few times a day.Spoiler 0: The best thing, Hit Points of monsters is way jacked up over the last playtests. These monsters can take hits! My biggest playtest complaint was that monsters died too easily.
Spoiler 2: I was surprised at how different a monster's Hit Dice were from its Challenge Rating. For example: an Ogre is Challenge Rating 2, but has 7d10 Hit Dice. I guess since AC and Hit are flat, all the difficulty comes from the HP and Damage. There are monsters that have Hit Dice over 20. There are a bunch of monsters that have stat scores over 20 also.