After putting 200+ hours into this game (easily, its probably at about 300 now) I finally made a dedicated Sorcerer. All that needs to be said is holy Batman this makes the game easy.
I've made pyromancers, which end up suffering later in the game and rely more on a weapon. I've mained a paladin for a long time, who is extremely fun but lacks true 'punch' short of Wrath of Gods. Now comes the turn of the Sorcerer, who allowed me to beat the game (collecting all items, clearing all areas/bosses) in 10 hours with a total of 6 deaths by my count, none of which were during a corpserun so I never actually lost any souls.
I killed Gwyn in 4 hits, destroyed invaders with 1 spell whilst laughing my ass off and generally had the most 'fun' with this game so far. Its not a challenge, its more a sense of the game finally giving you the power to do as you please.
So to all my fellow duders, if you have not yet made a pure Sorcerer, I beg you to try it. You won't have a decent weapon for a long time (Velka's Rapier is my choice) but you honestly don't need it when the most basic of spells 1 shot every enemy and you carry 60 of them from the start.
Also if you get invaded or invade MysteriousFawx...expect a homing crystal soulmass to destroy you, my highest hit on a player so far was 1200 and his health just vanished.