Yep, I pretty much agree with all of this. I didn't really care about the mother and her interactions with Magnum since the writers are making it very clear that they're going to go with Magnum/Higgins and probably sooner rather than later. For that same reason I really don't care about Magnum's betrayal by his previous love since it'll probably just be used as a plot device to keep Magnum and Higgins apart at some future point.
Once again, Rick and TC were the best part of this episode. Their joking while hunting for the cat felt really natural and searching for Magnum at the end could have come straight from one of several original series episodes. But five minutes of screen time just wasn't enough IMO. Of course, I clearly won't be happy unless TPTB turn the show into "Rick & TC, pi's", LOL, and that's not gonna happen!
And yes, as a cat owner myself I would have liked to see Max end up in a new home, especially since he reminded me of my orange guy.