As a general rule, boss weapons are never too impressive stats and damage-wise (they look awesome though). The fury sword is nice to have to help against enemies that are weak to fire, which are many as you'll find out.
That shield sucks, it's true. Try to get the grass crest shield in Darkroot Basin, behind the Halberd Black Knight. You can also try the Balder Shield.
I already have the grass crest shield but I am gonna get the balder shield from the crestfallen merchant, since i heard its one of the best light weight shield available.
Ill try to get fury sword, since many are weak against fire.Chaos Blade with 40 Dex and 10 Humanity is the best Katana in the game.
If you have high intelligence, the Moonlight Butterfly Horn is a really good spear that does magic damage and has a lot of reach.
Most boss weapons are bad though, but there are a few standouts.
Having 40 dex wont happen soon, since this is my first playthrough.