Blasters are only useless against trained jedi who have the skills required to deflect the bolts.
Finn is not trained.
FN-2199 knew that he could shoot Finn, but decided on a more personal approach

Didn't Rey at one point say that she hadn't heard about a guy called Luke Skywalker before? Or do I remember incorrectly?

Luke Skywalker is pretty much a legend to everyone.

She didn't know about Han too, if I remember correctly, and Finn had to explain to her what he'd done for the rebellion.

She did know about Han, she just didn't recognise him straight away. When she was told it was Han, she was like
"Holy shit you're Han Solo, you did the Kessel Run in 14 parsecs"

It's 12 parsecs... Fourteen. Hmmph.

Oh, you're right.
I also go thet Rey thing wrong, I looked at a transcript. She did 'know' about him, but assumed that he was a myth, which'd point to her not being one of his padawan.

i thought the fact that when he killed solo the anger and the wound would "boost" his sith powers, since the siths harness their powers from hatred and pain. for example, he kept punching his wound so he could get pumped up for the fight and get the emotions coming

This is true, but Kylo was so conflicted about his involvement with the Dark Side throughout the entire movie. I think he couldn't harness the full potential of those things because he hadn't yet completed his Sith training. He punched the wound multiple times throughout the fight with Rey, as if trying to get that pain to " 'boost' his sith powers" as you put it.

I hate this argument of "Oh. Rey is good with a staff so she must be okay with a saber."

No. Just no. It's explicitly stated in canon that using a Lightsaber is nothing like using any other kind of weapon. For one thing, it's completely unbalanced. The blade is completely weightless, all the weight is in the handle. And that changes the entire style. You couldn't go from fighting with a perfectly weighted staff to fighting with a weightless blade and still be good. You'd have to practice and practice with it.

There's reasons that Jedi and Sith were trained for years. There's a reason Luke barely swung the saber around much when he first got it. Because you cant just pick it up and be good. It's unlike any weapon ever.

If you don't mind me asking, where in the canon does it state that? It makes sense but I'm curious

Well fuck everything. I went to go get your sources and it's all in the now dropped EU. So I guess Sabers can now be whatever the fuck Disney and Jew Jew want them to be.

It's still fuckin' silly tho

The light sabre handling didn't bother me. It was the fact she could pilot the millennium falcon so well with no experience, know where every fuse and sprocket of multiple starships from just scavenging 30 year old rust buckets and the fact she could master the force faster than Luke did while training under yoda. There's suspension of disbelief but all that was a bit much. Film was epic otherwise.