IMO, some solo contents required to finish the meta in the map or group event. For example, Dragon's Stand map completion, I tried to complete the map but I have to wait for 6 days until meta group came up with the exact time I play due to different time zone. I think map completion is solo content but why I have to wait for meta completion?
Then again I tried to finish the Requiem Armor but cannot because no people to help me in group event, I tried to shout in the map but it seems the map is empty.
Also the wiki is required to complete the quest. I played other MMORPG game and it even point out where exact location you need to go but in GW2 it just short description and give zero idea what it said. For example, "Far above the Pact Command", does anyone got the exact location where/what it is without wiki/google search?