User blog comment:Fistful of Force/Nami is actually a really good support/@comment-3486816-20130120060454

Nami is very carry-dependent compared to other supports.

The issue regarding her not being played much isn't because she's not good so much as that she's not better. Being on equal standing with other supports (which I believe she is) gives her a disadvantage at this point (by which I mean shortly after her release) until the minority who enjoys her show that she's worth learning. Otherwise people just stick to what they know. It's a common pattern that most champs go through.