Having watched original Macross(plus movies and specials),Zero and Plus,I believe that Frontier does a great justice to the saga although it cannot surpass the original.
Animation,mecha design,sound are all top notch.Amazings songs,ultra colorful intros(2nd opening "Lion" is pure greatness) and a quite good plot,though not so good as the original.
What is a bit bad with Frontier are the characters.Basically,the main character.While he isn't bad,he's also not something you'd expect from the main character.Sheryl and Ranka on the other side are quite interesting characters,unlike Alto.I thought that Sheryl was a bitch when I first saw her at episode 1 but as the episode count progressed,she appears to be the most dramatic character.Ranka had also some good moments, especially at episode 20,which imo was the best episode of Frontier so far.
As for secondary characters,Ozma is my favorite and Michel,though nothing special
as a character,gave us quite a dramatic moment.Same goes for Klan.Not much to say about the others...
Anyway,after Code Geass R2,I'd surely vote it for best anime of 2008 second half.Amusing and interesting,nice mecha fights in superb quality and resolution,cool songs.