Almost every time an actor is replaced by another it creates a big problem for the audience. The bigger the role, the bigger the problem. It's understandable because the more we watch the more invested we are. We all loved the old Anna Kat so it doesn't matter how good or cute the new Anna Kat is, it's going to be a hard adjustment. Truth of the matter is that the new Anna Kat is fine. The actress is doing a good job! It's not her fault, she just can't fill in the hole the old Anna Kat created when she left the show. Unfortunately for the writers there was no other way to go about it but to replace the actress. It's impossible to kill off the character or send her away (like they did with Angela) so this is the only solution. I kept on watching season five and I think she did a good enough job.
Unfortunately this is the last season so if you are binge watching the show (like I just did) you can keep on watching it to the end. Just be aware that season five isn't as good as the previous seasons. Old Anna Kat is gone, Angela is gone, Doris is mostly gone, the writing isn't as good as before and the show ends abruptly on the 13th episode. On the plus side, we see a lot more of Cooper (I love him), there are still enough laughs to enjoy and some new characters to like. If you loved the show and watched to this point then I suggest you finish the season.
Unfortunately this is the last season so if you are binge watching the show (like I just did) you can keep on watching it to the end. Just be aware that season five isn't as good as the previous seasons. Old Anna Kat is gone, Angela is gone, Doris is mostly gone, the writing isn't as good as before and the show ends abruptly on the 13th episode. On the plus side, we see a lot more of Cooper (I love him), there are still enough laughs to enjoy and some new characters to like. If you loved the show and watched to this point then I suggest you finish the season.