He shouldn't be, Eldrich Blast is a great power. It can be used as a Ranged Basic Attack which means it can use bonuses to that attack. You give a Warlock at like 3rd level a pair of Bracers of Perfect shot, have him multi-class into Ranger to gain Hunter's Quarry and take Lethal Hunter, and you have a Warlock that can open a fight by pointing at the enemy closest to him, Cursing, Quarrying, and firing his Eldrick Blast for 1d10+1d8+1d6+7 (assuming +2 for the Bracers, +4 for attribute bonus, and +1 for a magic rod which he should have my 3rd level).
10+8+6+7= 31 damage if he rolls max, 10 if he rolls min. 31 will nearly drop a 3rd level monster.
It's also thematically awesome. Generally it's considered to look like something akin to a black lightning bolt.