They could never have pulled this off if it was just trying to literally be a beat for beat remake. An adaptation needs to add some new flair to it. Also the fight choreography would have been really hard to pull off in live action.
I think they got the essence of all three pretty well done. It was always going to be weird hearing different voices for these iconic characters but I think they all act pretty similar to their anime counterparts
It is weird to have Spike look so old compared to the other two. Again it is something that will take some time to get used to. I always felt Spike to be young and aloof despite his past but this makes him look almost... I dunno, haggard? Works in regards to his relationship with Vicious and Julia but not for the other 75% of the anime.