If you do archon forge for 20 minutes, you've seen everything that the forge has to offer forever. It is very boring. I will say that I do get a god awful amount of bonds, marks, and cloaks from archon forge. But I also get them from every single other aspect of the game, so it's not worth it. Strikes are more fun and also grant vanguard rep. Crucible is more fun and also grants rep and better loot. Aside from the shiro bounties, I see no reason to do the forge. This is very sad because I was extremely excited about a horde type game mode in destiny. Maybe if they put burns or other modifiers on the forge it could be more fun.