For open world PVE, Core Dagger/Dagger Elemenalist is a ton of fun and isn't hard to learn. You just memorize one combo for each of your attunements then cycle through Air, Fire, and Earth. You only switch to Water if you need extra healing and that's rare. If you're coming from another MMO, the amount of buttons you're pushing isn't anything out of the ordinary.
Also, you get tons of defense in the form of 3 dashes (with iframes), 2 force fields, and some really good CC skills. There are also some tanky traits in your Earth, Arcane, and Water specialization trees. I was soloing most open world Champs after unlocking my second specialization using Air/Arcane and that was wearing crap gear.
It's a very active and exciting play style and you'll hardly ever be standing in one spot spamming auto attacks. Also, when you unlock Elite Specializations , you can stick with D/D for Tempest and Weaver if you want, but there are other weapon combinations that are slightly better if you want to go with a meta build. You don't have to be meta to be viable though.