Pretty much the show (to me. This is my opinion) is about how the four girls, Ruby, Wiese, Blake, and Yang, develop as friends...
As demonstrated by Wiese having to learn variations on the same lesson repeatedly.
...and how they solve some secret mystery embedded in the show (Like seriously, what the hell is the headmaster planning?).
Kind of interesting, I guess, but it's been shoved to the side and downplayed enough that I barely notice most of the time.
Also, that Scyther Rifle is awesome and Ruby made it herself with help from her grandfather,
Nothing special.
And the spear gun has proven how useful it is time and again (seriously that catch though XD)
Why the hell do they have an expensive-looking, complex, non-explosive weapon which is commonly just thrown away, without even any way to snag it back?
Also, I like RWBY. It's good action.
Eh. The action is, in my opinion, pretty mediocre. They rely on the awe factor of the weapons too much, and they're just so absurd. Not to mention that if you're watching it for the action, you're watching maybe 20% of the episodes.
Not helping matters is that those characters that in my opinion are the most interesting are barely seen (*cough*Ren*cough), while the main characters are comparatively...well...painful cliches.
I give no fucks about the plot.
I just skip to shooty bits. I need my shooty. I WANT MY SHOOTY
That's why I practically ignore canon when I write RWBY fanfic. 
...
How is it even still fanfic?