The more I think about it, the more disappinting this movie seems..
Take Bills. He made such a big deal about facing someone close to his level. He was so happy to find the Super Saiyon God, that he even spared his planet against their deal.
And then he sees Freeza, who attains an even higher power level then Goku did, and he did it all by himself without any help from anybody. Bills should have been a lot more surprised, impressed, or interested then he acted.
And like I said already, Vegeta was totally out of character beating on a defeated opponent, considering how he insisted fighting Cell at his best. Sure, Freeza used low tactics on Goku, so maybe he figured he didn't deserve a fair fight..
Then there's the question of, why even bother? Freeza beating Goku, and Bills stopping him from killing him or something, then letting Freeza go to rebuild his empire would have been interesting. Or maybe doing a story where Freeza reforms enough to only care about beating Goku in a fair fight.. Say, give a speech about how he lost everything, but his only interest was beating Goku for his own pride. And watch Vegeta suddenly gain respect and empathy for him. 🙂 (After all, Vegeta's a former mass murderer and villain, and he never "really" seemed to give a crap about his own people or planet.)
I dunno, there's so many ways Toriyamw could have gone with this. Felt like a waste, imo.