Quoting:
<...> The problem is that magic is... well, it's arcane art.
Magic stat is the most useless stat, ever, for those who don't have it in primaries. I can imagine getting points in Cunning, if only for crit chance, on any character, but Magic? God forbid. I can get decent spellsave from racials or equipment. When I get antibonus to Con or even to Str due to race/class, it's a big deal and I try to fix it. When I got Mag 8... it's probably Mag 8 for the entire run.
Mana is more or less under-used, too. Of three classes that use it, two need two invest into Willpower to raise mana limit, because they use mana limit more actively than actual mana. (Just to be clear, I'm talking about Archmage, who is a creature of shields, and Disruption Shield is garbage without high mana limit, and Necromancer, who probably needs Magic even less as he got minions).
And then there's Antimagic. "You don't need this stat anymore". Lovely.