Why were some disappointed with the film Rocky Balboa?

[Savoy1984]

When it was released at the cinemas I went to see Rocky Balboa and I enjoyed and was moved to tears when the training montage came on, but in recent months I've spoken to a few people who really thought it was rubbish and I've been trying to figure out why.

I would love to get some boxing fans opinions on the film and try to shed some light on why to some it was a disappointment, so what do you think?