You'd actually see the size of every boss. Every single thing would be devastatingly horrifying. The whole "everything in Dark Souls is just a big bad thing that wants to kill you" would actually be a big bad thing that wants to kill you! I MEAN! COMEON! That'd be awesome! You could create your character after EXACTLY what you want to be. Want to use a katana? Put stats into dex to learn how to use it better. You literally feel more familiar with the dex-weapons. You hit harder with str weapons when you puts stats into strength. Your miracles simply flow easier and stronger when you have more faith. You simply know how to cast magic when you get intelligence. You can carry more with endurance. You simply don't get hurt as much with resistance. You can memorize more spells with attunement, and you can take more of a hit with vitality.
You can then use your favorite weapon in whatever way you want. Granted, the blade will determine how you want to swing. You wouldn't want to just swing your rapier. You need to stab. A gargoyle halberd would hit better swinging down than a normal halberd because of the blade. Everything would be new. Almost any weapon with a point could be used by Leo's Ring. The flip ring would take more stamina to flip (that's my fix. Make the flip take up half your stamina, it won't be as OP), the wolf ring would make you feel like rock: unmovable. The havel's ring would make anything you're wearing feel lighter.
Could you imagine the awesomeness?
SCIENTISTS NEED TO DISCOVER MAGIC RIGHT NOW!