Nam ek stomps Phase 1 Avengers. While learning to fly, Superman jumped very high and flew for a few seconds, he lost his concentration and fell back down to Earth and crashed through a mountain; only to be disappointed that he wasn't able to maintain his flight.
Thor was dropped down in a glass contraption made to kill the Hulk from a similar high and was panicking when he was dropped down to the ground and barely made it out of the contraption. Hulk also fell from a similar high (from a jet near the Helicarrier), and was knocked out but Banner survived.
I mention this because both of them nearly died from a great fall back to the ground, while Superman fell from a similar high and was unharmed but disappointed from the impact. Nam ek has similar durability, strength and speed to MoS Superman and should stomp all of the Phase 1 Avengers because of this.
The only way possible for the Avengers to beat Nam ek is if there is a way to damage his armor and give him a sensory overload and make him disoriented, but if he adapts as quickly as Zod did then the Avengers would lose even worse.