First of all, what is love? Even beyond the classic divisions of Eros, Storge, Philia, and Agape, which are all markedly different things you have more modern subdivisions of it. Is love still love if only one party feels it? The term unrequited love is well know and acknowledged isn't it? What if one person hates the other, whether a parent and a child or a stalker and a stalk-e, is that still love? What about love that is socially taboo? Pedastry was accepted as a valid form of love in ancient Greece, while lesbian relationships between adults weren't considered as such. There is also the fact that love can cause great joy and great pain, and any other number of emotions depending on the exact circumstances it exists in. It can also cause great works to be manifested or great tragedy to be wrought.
Saying "love is love" sounds to me almost like "A gun is a gun" without clarifying if you mean a water gun, BB gun, hand gun, or an assault rifle. It appears to me as a worse than meaningless phrase because it can easily be turned against those who use it.