It is fun. It is more team based than AC. It's a lot like old school UO, but 3D obviously. No levels, No XP chains, No vassal/patron system.
Its a skill based system. Which means when everyone is capped it will be player skill vs player skill.... Or bandwidth
You dont accumulate XP to distribute into other skills like in AC.
If you want to raise your sword skill you have to go use your sword,
Want to raise your running skill you have to run around, ect..
Combat is 100% different. You dont click on a target and then hit the auto attack button like in AC with the occasional slidecast thrown in. DF plays like a FPS game that requires alot of hotkeys to change spells/weapons like all mmos today.
If you like resource gathering and crafting this game IS FOR YOU! Or you can just buy stuff. There is no repair option your gear gets damaged over time and eventually is destroyed. But that's not a big deal because there is no UBER quest loot or mob drop stuff. All armor/weapon are craftable with the right material which could be a rare drop off a mob or from a mine.