mind blank- essentially screw the enchantment and divination schools for 24 hours
Yeah. I'd define any spell that utterly shuts down multiple character concepts as "broken." I lean towards including Freedom of Movement in the same category.
My friends and I tend to hate Windwall for much the same reason.
My buddy Kantolin calls these "you must be X high to ride" spells. They give no save, check, or any way, just flat out block.
Freedom of movement giving +20 or even +40 to checks to avoid being grappled would be fine. Negating grappling completely is just kinda cheap. Ditto Windwall flat out stopping all non-magical ranged attacks that aren't siege weapons.