Because of choice and diversity, every different version has different effects.
Burden is likely to stop your enemy in his tracks for a long while but it will be casting spells at you or shooting arrows at you without remorse.
Damage Strength may slow down your enemy a little and make it do less damage for a while but it's still quite functional.
Paralyze will completely lock down your enemy, no spells, no sword swinging, your enemy stops. However the bad part is that the spell is expensive and generally lasts only for a short while, a lot shorter than the other two spells.
Basically, burden did nothing, and was a "lite" version of damage strength.
Damage strength shut down melee completely while being somewhat less effective vs. ranged enemies
Paralyze worked on any type of enemy excluding some special resistant types, and had a more balanced duration and cost.
I'll take the spell system with just paralyze over the one with all three, personally.
How is that a problem??????????
It was an immersion breaker and it was imbalanced. Kind of stupid that for all the intense studying of many incredible wizards over hundreds of years, the PC can figure out more effective spells no problem in a single day. And then the PC, even at low levels, can kill anything in the game easily.