The Bojack Unbound movie is not particularly impressive or even good from my perspective at least. I found it ridiculous how Bojack and his crew are referred to as "Space Pirates". The voice actors should be praised for their hard work and the animation was just like that of most Dragon Ball Z movies. The overall story was not impressive and I didn't enjoy it. I also found it ridiculous how weak Bojack truly is in battle, his durability is awesomely lame and he is a coward which I did not like. The fact that he turned to his crew for help out of fear of Super Saiyan 2 Gohan was somewhat disappointing as even Cell for a good amount of time attempted to fight back against Gohan until being completely outmatched.
Bojack is supposed to be a Cell-level villain if I'm not mistaken and yet he was barely Perfect Cell level. I enjoyed how Bojack was defeated though. I don't know what to think about Goku punching Bojack from Snake Way in order to save Gohan and help him transform into a Super Saiyan 2. I found it kind of corny that when Gohan turned into a Super Saiyan 2 he yelled out that he was his father's (Goku's) son.
I however enjoyed Teen Super Saiyan 2 Gohan in his badassery unlike his adult counterpart. It was enjoyable watching him defeat Bojack's henchmen with a single hit to each in a similar fashion to how he destroyed the Cell Juniors during the Cell Games. Even though I did enjoy how Bojack was defeated by Gohan I can't help but feel that the creators of the movie kind of rushed the ending like most of the Dragon Ball Z movies which isn't quite a good thing.
In total I'd give this movie a 2 out of 5. It was not something I would recommend but it is watchable and something that one could use to pass the time. It was mediocre at best.