The love story is very believable, it's been subtly yet intricately woven into the previous four seasons.
In the last episode of season four we finally got some on-screen acknowledgment of the feelings Charlie and Sarah have had for each other for years.
It's nice to see them as a couple.
I am very impressed at how deftly the writers of Hudson & Rex have handled the relationship while not taking away from the show's storylines. The actors have amazing chemistry, something that has been noted by the show's writers in more than one interview.
Sarah and Michael were purposely written not to have chemistry (which is hard, when you have talented actors like Mayko Nguyen and Andrew Bushell, but they played it so well) because their relationship was a plot device to further the Charlie and Sarah storyline in season 4.
The show has gotten infinitely better since they became a couple, because it takes nothing away from the plot and instead humanises these characters we've grown to know and love over five seasons now.
It's great that the writers realize that sometimes coworkers end up in relationships, and that the show cast these two leads who have such great chemistry.
The love story between Charlie and Sarah (what's with just using and misspelling the last names?) is fictional, so, does it really matter if it's improbable? (It's not, by the way. They've always been endgame.)
But if the show has somehow gotten worse thanks to the romance, then perhaps...change the channel?
(This review comes courtesy of iMDB not having the option to reply to reviews.)