On 2nd viewing I liked Kylo Ren much better. Criticisms of him as juvenile are ridiculous. He's a great bad guy. Quite conflicted but awesome. I think he is going to become absolutely insane and fearsome in the next two movies.
My other complaint was how everyone seemed to be able to handle a lightsaber pretty damn easily. I can understand Rey since she has the force but Finn? That was too much for me given the importance of this weapon in connection with the Jedi and the Force. He shouldn't be able to just pick it up and kick ### with it. .
I figure he's a stormtrooper and been trained at a young age so he's had training in all kinds of weapons. While not specifically with a light saber, the techniques of the other weapons apply. Same with figuring out the weapons on the tie fighter and Falcon. People wouldn't even bring those up if he just jumped in and knew how to use them. It's just that he's unsure that causes people to bash it.Same with Ren fixing things. She salvages parts, so she'd know what things do and the systems in their operation. Also people bashing it aren't realizing that she's living in a culture where these machines aren't as complex to them as they are to us. Compare what is common knowledge to us today compared to people 2,000 years ago. That's the kind of technological separation between us and that in Star Wars. The people in Star Wars are just more knowledgeable about tech than us. Look at how little kids are able to operate tech today before they can even read or write. Our tech is like stone or bronze age in comparison to Star Wars.

The Trooper fighting him with the weapon that could deflect the saber was standing toe to toe with him showing they have been trained in close combat..
Yeah but a lightsaber is a special weapon. An almost magical one. Maybe I'm being stubborn and silly about it but it just seems that only someone with the Force should be able to handle it with ease. Now maybe that's something we'll find out about Finn later and if so then it would make sense. I do think his parentage will come to play. The line about being ripped from a family "I'll never know" seemed to be planted for a reason.
It is a sword. A sword made of light but still a sword.
This. He was fighting with it as a weapon, a sword, plain and simple.
Now if he would have been deflecting blasters with it, that would be using the Force to heighten his perceptions and guide his technique.
Luke: "The Force controls your actions?"
Ben: "Partially."
So you're fine with a storm trooper picking up a light saber for the first time deflecting a number of attack attempts from someone with Kylo's ability? That's crazy if someone like you or me picked up a sword for the first time and went up against a skilled swordsman we'd be diced up in seconds. There is something special about this Fin character.
I can't speak for you, but I have zero military training in hand-to-hand weapons.
Also, I think Kylo isn't the best swordsman around. His strengths lie elsewhere, in telekinesis and telepathy.
Even Vader couldn't use the force to read people's minds. At best, he could sense people's presence.