In a testament to the game's poor balancing this boss was barely an inconvenience for me. I had a lot more trouble with Rennala (until I gave up and came back with the right kind of spell, then she just fell over).So yesterday I defeated one of the worst bosses of all time, the Red Wolf of... whatever it's called, in the academy.
Your troubles with guys who can zoom around are unfortunately not over and will only get worse. The worst offenders are probably Fire Giant, Astel Naturalborn of the Void, and the Elden Beast who can not only move around a lot, but move well out of sorcery range. Maliketh is a different category of horrible because while it's very fast and was able to repeatedly one shot me, its arena isn't big enough for it to be completely out of reach. (I know a lot of people have trouble with that fight's first phase, Beast Clergyman, but because it's vulnerable to magic and I had Mimic Tear I had very little trouble killing it with big spells.) Malenia is in a similar category, but bringing in a couple of online mates to hold aggro while I yeeted big frost spells meant I didn't really "do" that fight.
My favourite bosses were Royal Knight Loretta and Loretta, Knight of the Haligtree which felt the most correctly balanced for a straight up fair fight against an Ash Spirit and Sorcery build.