lvl5 goblins are really great. When raiding mines there is nothing more effective as goblins. They are fast and do massive damage to ressources and also they are very cheap. Barbarians are slow and get distracted by other buildings. You have to learn when to use goblins and when to use barbarians. With only mines on the outside, use barbarians. If there are other buildings in front, send in the goblins.
Also for storage raids they are really good when combined with giant + barch, but you have to wait for the best time to send them in. If there are already walls left, they will all go to the same Piece of wall and die by the mortar or wizard Tower. If the wall is open, send them all in. About 30 of them are fast enough that the mortars do not get them is most cases. If you have a base with all Storages in the middle, break it open and send them in and place a heal spell.

