Life is Feudal is a complex sandbox box, with a very open world. For those of you that remember it, it's VERY akin to the old Star Wars Galaxies (pre NGE)

Pro's:
-Complex Crafting system.
-Fantastic system to socialize, as it is impossible to pick up every skill
-Complex skil system that allows you to try new things, grow into new skills, and forget them if you don't like them.
-Fantastic challenge rating for skills: Easy to pick up, time consuming to master. You can grow, loot, and craft high quality materials.
-Great graphics. Really nice visuals on higher settings.
-Terraforming: Push over minecraft, you can literally level landscapes, dig siege tunnels, and build ramps. Or just flatten terrain so you can build a city!
-City building: Akin to SWG, you can drop down pre-generated structures, tools, build roads, claim ownership.
-Nothing is worth doing that doesn't take time to do: This whole game takes time. It's not a fast paced, get your guns in a day and rule the world. BUT... it is fantastic, and well conceptually well designed.

Pro&Con:
-This is an MMO Sandbox. It is what you, and others make out of it. If you want to be a trader or bar keep, you can actually craft resources, make food, sell high quality foods, trade for better resources, and even pray for absolution from your sins. However, for every peaceful choice you make, someone out there will want to be a rampaging psychopath that will run into your shop and wreak everything...

Cons:
-Right-click-simulator: The game is fantastically in-deptch, but in order to make it EASY to manage, it uses a right-click system. Where you end up openning that menu... A LOT.
-It doesn't like it when you alt+tab. Seems to work better on windows 10.

TLDR:
This game is a fantastic open world complex to the likes of SWG Original Release. It's got a deep crafting system and really encourages social play. So build your character, find new people, and start carving up your plot of land! Because this IS the sandbox game you've been looking for!