Short and Simple (I hope) of GW2 (since I assume you know enough about FFXIV):
"Infrastructure" / UI
- The UI is very polished; drag and drop. No "are you sure you're sure that you're sure?" We are talking 1 click to get to your storage, whereas retainers need what.. 3-4?
- Inventory management: Things are organized; things are labeled (aka "junk"). There are 1 click "sell all my junk" at vendors; there is "automatically put all my crafting items in their allocated storage area". You can deposit these gathered materials anywhere.
- Mail and market anywhere: You can send/receive mail; you can shop on the market board (and the Real Money shop) anywhere...anytime. You can use in-game currency in the Real-Money shop.
- Dye system (already talked about), but it is legit awesome.
Gameplay:
- Has an actual physics engine, allowing for legit jumping puzzles, Mario-Kart esque races, etc. The mini games are fun and welcome. Try the "Hungry Games".
- Mounts are awesome. There are different types used for different things.
- The actual gameplay parts could use more polish; that is to say, some boss fights are easy, some are very punishing, some are just loooooooooooooooong and boring. Nothing really memorable as aweful..but some situations you are better just making a specific build for that fight and cheesing it. There is nothing really truly comparable to FFXIV’s better combat encounters…but the system is similar.
- Their "Fate" system is arguably better- there are typically 2 or 3 ways to progress any one fate. For example, bandits attacking farm. You can contribute by A) fighting bandits, B) putting out fires or C) rescuing livestock. Additionally, almost every zone has a chain of fates that lead to something big, like a world boss. This is in practice similar to things like the Fox boss in Yanxia, but in practice the finale is MUCH more like a trial boss in XIV.
Story:
- This will be hit or miss; it's fine, but nothing Oscar-worthy. There is a glaring issue of missing story parts that are gradually being added back. Imagine if when FFXIV 3.0 launched, 2.x was no longer available to play. Just a text blob summarizing it and BOOM, new cast of characters. Everything else is good, but there is a gap in the story between the original game and 1st expansion. Again, it is gradually being added back in.
Characters:
- 1 Character has 1 class, but each class has different specs you can work out.
- The classes are less playing a role (Tank/Healer) and more like picking a character from Smash Bros. You can spec to a tank, but no specific job is a designated tank.
Endgame:
- There's a a lot you can enjoy here...but it's mostly "FashionWars" in the same way FFXIV is a lot of glamour at endgame.
Hope that helps!