Wow. I liked 0.86. Played it alot. 0.90 introduced some bugs (like the outcome of a fight in the battle screen would show before the character swung the weapon).
In my opinion 915 is unplayable. The game balance, even on easy, was ridiculously unbalanced. Enemies routinely declare war on me - at one point I had the whole world against me, and then they send wave after wave of armies.
And, as someone said before, the wandering creatures seem to have supernatural line of sight and knowledge.
I know that this is a beta. But isn't a beta supposed to be steadily fixing bugs and refining gameplay? There have been huge UI and interface differences between 086 and 091. Some of the trading UI is better, but most "improvements" are just messy.
I would expect these huge shifts if the beta was around version 0.5, but come on!