I wouldn't consider the Forsworn or the Blades a guild. if we are including every faction thats present in the game. then there is a sh*tload of them.
I agree. The Blades are forced upon you and really only adds a couple quests. The Forsworn only makes one set, friendly with you and you get unique armor.
well the blades will turn hostile if you side with the greybeards at the end of the war right. i forgot its been awhile. Neither the forsworn or blades are actually guilds. but at least you get something out of them lol