Ed and Kelly are feeling awfully blue
The title for "Cupid’s Dagger" tells you a good deal of what you need to know about this episode. It’s in a long tradition of farcical comedies about people falling in love for reasons outside of their control, leading to broad silliness and embarrassment. Usually the question for a show like this is: Did I laugh or did I cringe? Maybe both?
Indeed, I saw this plot just earlier this year with Grimm‘s "Blind Love," which was a fun example of good-natured silliness as a humorous detour. It made me laugh, especially when a character fell in love with himself and sang into a mirror. That was a good twist. On the other hand, the cringe example that always immediately springs to mind is DS9‘s "Fascination," which was just an awful collision of characters rushing to the front of the line to embarrass themselves.