Magic seems cool so far, i like the soul sword spells, but theyre not hitting too hard, so most of the time i just find myself plowing through with a great magic weapon buffed broadsword. Cant wait for some soulmasses and spears though, theyre goign to be sick.
I have yet to find and test a soulmass, but I doubt the spear will be any good in PvP... It's close to impossible to hit anyone with projectiles in DS3, and it will be very FP expensive to spam. I am hoping for aoe spells, or something similar to sword spells, or even summoning of turrets of sorts ( like that pyro hover ball that shoots smaller fireballs )
I don't use buffs, as it just makes my Mage another type of melee char. It's a matter of taste of course...
Edit
That farron sword spell I was talking about earlier costs almost no FP, and takes very little stamina, casts instantly and has good range. With my 35 int, it hits as my normal +3 crystal short sword, it's not much, but I can cast about 8 of them before running out of stamina, and they really fly quickly, I would say they spam with dagger speed, or even faster.