It really is fine. Actually regular weapons are still more powerful than tenebrium in many cases, especially because you can craft them, so they can be :-
- sharpened for lots of extra damage
- added tenebrium damage by adding a bar to them
- also have elemental damage
- add str and DX from tormented souls
- I probably forgot some other things.
I hardly used tenebrium. It doesn't require you to throw a hissy fit. You can still win, easily, every fight with regular weapons. That said, you get plenty of points, and there's so much levelling it's easy to get plenty of levels in tenebrium if you want to.