I play a all night goblin army, new to playing warhammer, well, I played 4ed, and picked up playing again after a long period of just painting random stuff.
The highest point games I've played are 1000 points, against Empire.
I find that a horde of 50/60 goblins with spears are decent in getting kills against T3 opponents. The odds of a single gob killing something might be small, but the stack up the odds of 40 of them and suddenly the unit becomes a lot more interesting. Sure, they're still no savage orcs with extra choppa, but then again a goblin horde would only cost about 250 points, including nets.
Mangler squigs are lovely, not only in the damage they can do, but the attention an opponent would want to give them is in itself a tactical advantage.