I found the storyline unconvincing. How did Ronin gain such powerful control over Beverly in such a short period of time? If his "anaphasic" powers somehow gave him the ability to manipulate her, it was never explained. Frankly, it looks like all he did was get her off and then she was willing to throw away her career for him. That certainly doesn't fit w/ the Crusher character.
The acting wasn't great either. The caretaker was far too abrasive, and the attempts to exhibit passion between Crusher and Ronin were over the top. And Beverly's struggle to free herself from Ronin's control seemed silly as well, in large part because there was no plausible reason to believe she was under his control in the first place!
Still, the episode has a few good points. It takes place in a unique location, and it fills in a lot of Dr. Crusher's backstory -- greatly expanding on the few pieces of info given in Season 1's "The Arsenal of Freedom".