Hey, JurisPoga! It's quite an interesting map you offered us which features various forms and even a word created using the editor tools. Still it's quite hard to decide whether this is a completely unrealistic map or just the parts. The huge square oasis will surely feed the three AIs (No matter how many farms they build), but it looks quite plain. The river is curvy but a bit untidy and angular, although the shore looks quite well. I've also missed various rocks, boulders, a bit more scrub: they could easily fill the few empty spaces. There are more than enough resources in the landscape, which make this map quite easy, but perfect for inexperienced players (The small scenario where you have to kill the enemy troops to gain even more goods, can be interesting, too). The AIs should have no problems finishing their fortifications, making a good 3 vs 1 skirmish battle.
Overall, a good map, but it needs a little bit more work on the design.
Have fun playing!
P.S. I've heard that you are from Latvia so we're like brothers :D