Thank you for playing, and for the detailed feedback!
Some of your points are things that are already implemented/planned for the next version:
- Chests will never be empty. Boss/mini-boss chests will have better loot as well.
- Randomized items with multiple affixes will be added.
- There will be a purchasable item to respec you character.
- Skills have been rebalanced. Keep in mind that some skills like Thunderstrike have the advantage of hitting multiple enemies, so their base damage is going to be a little less than the single-target skills.
- More skills are planned as well.