Core set card without review about 5 years from launching the game? It can't be...
Luke Cage is a 4-cost Protection blocker with the tough and 5 health. Only 9 other aspect cards got 5+ health. In minimum he can block twice and attack for 2. So it's like 1ER for 2 attack (standard rate) and 2ER per block which is like got 2 ally for cost 1. Not bad.
In solo this card is a little slow, but if you got a lucky 3 blocks it's very solid. In multiplayer when there is a chance for more minions, he is still a solid option.
I rate him B (for strategy with blocking) and his value goes down with the more hitting villains.