Highway robbery!!!
Even the resources behind your wall aren't safe.
Here is how it's playing out right now.
Player A get's hit by Player B while player B is away.
Player B get's all the resources from city and hits oasis's to clean them out as well.
Since player B can't search for a name on the map, he has no idea where the attack came from and has limited options on hitting that person back.
I'm seeing this a LOT now that people are getting bigger and bigger armies and needing to farm resources, and it's basically leading to people robbing frequently from everyone else.
How about the option to build walls on oasis's? (I don't want to have to store part or my army on an oasis and risk losing my troops)
As for City resources, there needs to be more protection of those resources at an earlier level so the higher level folks can't bully them by keeping their city drained.
That's just my 2 cents on this.
I see this causing a lot of people to get frustrated in the future because of other people not keeping the game very fun.