First time I tried to watch this it was when it was coming out, I stopped watching around the middle, so disappointing. After almost 4 years decided to give it another chance, and I found it more to my liking. This is not a Macross Frontier, the shoes left by Frontier are way too big for the cast of Delta to wear. Still, it was an enjoyable ride, although the songs are extremely catchy and good and fit the mood at some points of the anime, the character build up is shallow and at times it seems they forgot stuff after half of the anime that they mentioned at the beginning. I did find refreshing that Hayate and Freyja were not as complex and complicated like in previous Macross series, same with Mirage.
My suggestion is, watch it if you are a hardcore Macross fan, since you'll get really good information and development regarding the Macross universe, but dont expect too much. Enjoy the music and also enjoy the uncomplicated relationship between the main characters!