Poor example.
One Anakin was protagonist they are meant to face challenges if he just showed up and beat Dooku that would suck, no tension.. but then in the story Dooku has been a Jedi Master for what? 60 years, was Anakin even a Knight at that point?
Here we have someone who has been trained for lets be modest and say he has been trained in the Force for a decade getting straight up owned by someone who didn't even know about the Force for what..3 hours before?
He isn't exactly a credible villain now.
But Anakin was supposed to be the greatest ever, and he even thought so. And went on to get his ass kicked. Hmm... someone thinking they're stronger than they are... sounds familiar.
It's clear that they were making the point that Ren is not fully developed yet. That. Is. The. Point. There is a character arc for a bad guy.. what's so terrible about that? I, for one, am glad they don't just insert Ren as a total badass. They are actually trying to develop him with time. How terrible! How does that not make him credible? That's ridiculous. He will have completed his training heading into this one and will be stronger. That was the whole point of this, and you seem to ignore it. Not to mention he was just shot with a blaster that kills most people. Also, it was a lightsaber dual. Rey has practice with her little stick thingy or whatever it's called, so it's not like she was totally without combat in her life. Once she channeled her inner force (like how Anakin does in Episode I, or Luke does in his training), she was able to overcome an opponent that overestimated his own skills and was weakened considerably.