User blog comment:Fistful of Force/Nami is actually a really good support/@comment-3329234-20130119045621

Nami's E is more like 1/2 of nunu's kit at most. Nami's E applies a buff that deals magic damage for 3 attacks and it slows downs the target and since you buff your ally it gives them a small speed boost for a really short time(1.5 sec). Nunu's W gives more damage via increased attack speed and movement speed. Nunu's E gives a movement speed slow and attack speed slow.