Why is Rocky 5 so hated?

I watched it recently and I thought it was great and much better than some of the other rockys. It has a different and unique plot line, it’s more a complete movie than a lot of the other rockys. In a lot of Rocky movies rocky is just shown as a buff 80s hero who has to defeat a impossible opponent but wins from motivation from Adrian, but rocky 5 showed him different, as a normal person. This was why Rocky 1 was so good, a normal person does an out of the ordinary thing. In Rocky 5, the fighting scenes were great too, especially the street fight. The flash back scene with Mickey was one of my most favorite scenes in Rocky. But Stallone himself said he didn’t like Rocky 5, which makes me wonder why it’s so hated when it’s literally just like the Creed movies but more based around Rocky.