Meesa was muy muy disappointed. Things to consider (some things already brought up) Rey was adept with her staff and martial arts in general it seems and at least some of that has to apply.
And while Finn is kind of a puss, he's still a storm trooper that has been training for battle his entire life. That's gotta be worth something.
Also, Kylo may have more training but he's also way out of control. He was basically standing and fighting based on pure, unadulterated wrath. Which will undoubtedly make him powerful but very sloppy.
I do agree that, while Skywalkers should always play a significant part in the main saga, there is a wealth of other characters and storylines they can tap into that would be just as enthralling but I'm okay with it in Episodes I-IX because this is a story all about the Skywalkers part in rebalancing the force.