Guild Wars 2 is a MMO-RPG developed by ArenaNet. It was released in 2012 and is scheduled to release it's 2nd expansion in September 2017. Screenshots have been taken on September 11, 2017. I've been playing this game casually for quite some time now. You create a character and explore the world of Tyria. In this world, there are factions to appease, monsters to kill, and treasure to find.
This game, like most MMOs, is centered around the pop-up. Guild Wars doesn't spend a whole lot of time exploring full width screens, but instead, keeps everything in movable and scale-able windows.This isn't a bad thing as it constantly reminds the player that the world is moving around them. The game doesn't pause when you open your bag or equip new gear. And having the windows be customized is also good as MMOs attract people of all walks of life. Some people would rather their windows be larger, smaller, left-bound, centered, etc. Guild Wars 2 also uses tooltips or "Hover Helpers" as I call them. A lot of information about equipment and abilities. This keeps the information on a "want-to-know" basis. Meaning it's not shown unless the player wants to know.
The content for Guild Wars 2's UI uses a sans-serif font that seems to be similar to Trebuchet MS. The looped G gives it a fantasy look while keeping it legible and structured. The headers for the UI are not the same font however. They try to keep the same theme with the looped G but if you look closely, there are small serifs at the end of some of the letters. And the lower-case T is curved on the top and the bottom of the letter. Both of these fonts keep a fantasy and friendly feeling while staying structure and can be easily read in large bodies of text.
Much, if not all, the colors in the UI is dictated by a gameplay element. Items and equipment are dictated by it's rarity, from white (basic) to yellow (rare) to ascended (pink). They are to tell the player how valuable the item is and what it could be used for. If you find an ascended crafting material you know you should save it because it could help in crafting ascended gear. There's a brown color that is used for abilities and skills. And the icons for those abilities are colored based on what profession you chose. A thief has red and black skills while a guardian has blue and white skills.
The UX of Guild Wars is much better than it first launched, however, there are still some problems. Some of the functionality for important actions are hidden beneath settings cogs. For instance, you have the option to deposit any materials you gather into your cache from anywhere in the world. You can get to this button from the cog in your inventory. For a new player, they might never find this button and walk around with bags full of ore and leather never knowing you can store it away. Another problem is the sorting for crafting. To craft you need to refine materials found in the wild. However, this refinement section in your crafting menu is mixed in with everything else. I scroll past the refinement menu almost every time I'm looking for it. You can search for what you want but you'd have to know the name of the item your crafting.