Simply put, I posted a Great Sword of Artorias build earlier this week, and it's actually really fun under a multitude of playstyles.
Here is all my weapons for the build.
The Cursed Greatsword of Artorias
This is the builds intended use. The Greatsword of Artorias is generally just your standard greatsword, but its got a significant increase in range, and this helps against a lot of opponents. I do not have it armed with a shield however, as it's intended to two hand it's weapon.
Anyone that has fought a Zweihander before knows how effective it really is. It's get a great attack speed, and in the hands of an opponent not fighting for a backstab, it's a violent and powerful weapon that easily dead angles and punishes many an opponent. I buff it with Gold Pine Resin.
This is one of my favorite weapons in the entire game! The damage might be low, but it's a perfect weapon for those that sit behind a shield and try to backstab you all day long. It can also be viably useful against a spear turtle, however this can require you to out DPS them... which isn't always possible due to counter damage. Fortunately, all your blows will be considered counters too. I also buff this with Pine Resin.
The Chaos Blade
Replenishment cancels the HP loss a lot of the time, and the Chaos Blade is the most powerful Katana when you're not buffing, which this build doesn't tend to be very good at!
Despite not having the best stats for it, this rapier is absolutely one of the best available! It's R2 is very more viable then the average R2, it does chip damage through a block, and it still deals pretty good damage when they don't block. I do turtle behind this item, and the rapier is just so fun to use against practically anyone. Please remember that 190 damage per poke = 10 hits to kill... when you are blocking, and essentially invincible. You have all the time in the world, and your pokes are not required to hurt all that much.
I don't attack often enough to suffer from a self bleedout with this weapon. Meanwhile, my opponent dies in 3-4 hits. I have a shield for if I have a sudden interest in parrying as well.
I prefer rapiers to spears. This is generally a direct response to anyone using the Dragon Slayer Spear to kill me. I also use the Dragon Slayer Spear on this build instead of the demons sometimes, but I usually favor the Demon due to having a shield.
I've had a lot of fun with this build, because I can do mid battle weapon swaps. In addition, because of my choice of equipment, I look like a patient from the insane ward; a white shirt, tattered pants, and shackles on my arms. It is both Aesthetically pleasing, and very fun to dress as. My poise is above the magic 53, and I do light rolls... while having an appreciable HP bar. I've never been happier with a build. I even have magic if I'm willing to work with lower grade effects!