Acting was very good by all involved - leads Michael B. Jordan and Sylvester Stallone are above good.
They are great in this picture, with Sylvester Stallone absolutely deserving Golden Glob nomination - its going to be hard to get Oscar node, but lets hope on this one, this is by far the best Sylvester Stallones performance since "Cop Land" and very first "Rocky" movie. But he is just a supporting character in this movie. The new star is Adonis "Creed" Johnson. Hope to see future movies with him.
Overall, "Creed" is a great movie. It has great acting, amazing direction(one boxing scene is done in one-shot take - never seen that before). Directing is actually on the same level as acting - Ryan Coogler does a magnificent job in every scene - it looks and feels real, not just another sequel or spin-off, it is a real life on the screen. Boxing scenes are all(and there arent many of them in the movie) great - last one(and you know there will be the last one "good guy" vs. "bad one") is not predictable(which actually is a bit, but that is not a complain to "Creed"), very plausible and realistic. Cant recommend this movie higher - "Creed" is simply a winner.