>>714993396 (OP)Despite being viewed as an MMO it's structured more like a single player RPG that happens to have online co-op. If you played GW2, you will have to abandon everything you know about that here. Due to years of power creep it is better if you try to play blind until you either beat the story of the campaign you're in, or hit a wall.
>>714998750Yes. It's very hard to do a true solo, but you can add AI party members as the next best thing. Henchmen are available in all campaigns as party members with fixed stats, and you can customize heroes obtained through doing the stories in Nightfall and Eye of the North.