Mobile Suit Gundam Seed is not just any anime. People should not really compare it to other Gundam animes, but compare it to other titles. Gundam Seed is not about its battle scenes like Gundam Wing and Gundam G emphasizes, but it is about the drama, hardships, and tragedy brought by war.
The story is mainly about two friends parted from each other just to end up fighting each other in a seemly meaningless war, although most of wars are meaningless. War is such a terrible thing, that is if you were in the shoes of Kira Yamato, the main character in the series, but to us it is just another war story, this time in color.
My summary on this is, yes, Gundam Seed is worth keeping. You might find most of the episodes quite short, this is perhaps to keep the series long. If you like sci-fi animes, you will probably like this series. It has a lot to offer, mentioning twisty storylines and excellent battle sequence. But I must say you should not expect much of this, especially if you are a Gundam fan. I would recommend this to someone who prefers an alternative theme of animes, or someone who has not seen any Gundam series.