pros:
1) good attack
2) Blood Fury improves their stats - a clear plus
3) War Cry increases Blood Fury and also improves stats (Tribes of the East can even kill a couple of Cyclops and greatly increase Blood Fury).
cons:
1) no magic!!!! except for magic of movement
2) weak defense
3) goblins-traitors are a clear minus (fortunately, betrayal is only present in the initial goblins)