I started watching this when it came out but to be honest I couldn't stand the animation. I watched both animes and to me the best animation is from Kengan, so I didn't liked to see that it was the style used in Baki. Although as you mentioned, I saw that it had an improvement and it looks better than in the main anime.
I think that this movie can be entertaining but it's mainly fan service and for me that's not enough reason to make a movie, you have to have a clear storyline because if not, it will be a very boring movie.
I agree with everything you said, you made a really good review! I recommend you to watch Kengan Ashura, you'll probably enjoy it :)
Thank you very much for your appreciation. I had a look at the first chapter and it's very similar to Baki Hanma, I'm still going to watch it as soon as I have a few days off. Thanks for your comment, it's much appreciated, as well as the recommendation.
Best regards.