I agree with most of what the previous comment stated... Macross 7 is indeed a big change in attitude. But it's a rather good one, in my opinion. The characters in Mac 7 are just so quirky that you'll grow very attached to them. You get to love Basara's attitude and Mylene's obsession for nagging him... And of course Veffidas' obsessive compulsive drumming. The characters just make me want to laugh out loud in every episode, and sing along with their songs. By the way, it also takes some time to get used to the music--I'll admit that when I first started the series I really didn't like Fire Bomber's music. But it really does grow on you, and I was moved to buy many of their soundtracks a while ago.
Mac 7 is a wonderful series if you want something with a light mood and don't mind the strange stuff that happens in the plot. The animation quality also isn't top notch... they re-use a lot of animations in the concert and fight scenes. But the art is amazing to me, especially the facial expressions of Mylene and Basara. It really is worth at least watching once.
