1) Wikia entries are retarded. Just throwing that out there.

2) No. MND does not affect magic defense, period. They phrased their wiki entry poorly. It does reduce the damage taken by Light-based Nukes only, because those nukes utilize dMND. It does not increase a universal "Magic Defense" stat, does not affect Magic Defense Bonus, and does not affect Magic Damage Taken-%.

Go to the Calculating Magic Damage page on lolwiki and you'll figure out why this is the case.

3) Wiki entries are retarded. The wiki page for Haste used to say that it slightly increased movement speed.