I have played a lot of Travian (the "normal" version) and I have achieved a decent amount of success. However, my Kingdoms campaigns mostly end in frustration. Out of about 5 Kingdoms game rounds, I have only once been able to successfully join a good kingdom and enjoyed the game.
My current attempts to join a kingdom have so far been fruitless. I am perched between kingdoms in a "no man's land" and cannot get a king to invite me. I then tried to settle my second village in a kingdom, but soon after I did this, the kingdom boundaries moved and I found myself back to square 1.
I find this aspect of the game highly frustrating. Maybe I am doing something wrong, but if I am then the game is overly complicated. This has been a frustration since Beta.
I will probably give up in the next day or two. Happy farming!