Overall, I don’t think the finale was extraordinary good or bad. There were a few fun moments (“she thinks you’re Kristin Bell”), but kind of underwhelming and disjointed. The biggest problem is that it didn’t feel like Liv had much to do- this is her show after all, and the most she does is push Don E into the well?
To be honest, I would rather have switched the last two storylines- find some way to resolve the FG vs dead enders conflict last week, and maybe develop the cure before having it stolen by Blaine. Then for the finale, have the main gang discover he’s going to sell the cure at some fancy black market auction for evil drug CEOs, and use the heist brains to steal it back. That way you have one last big character theme for main characters to play, and probably work in a more satisfying final confrontation between Liv, Blaine, and- sure, why not- Don E.