Well imagine every over the top anime, and every single mecha cliche crank up to eleven.
The story is dumb, plot is ok, and it is swimming in deu ex machina. But you can feel the passion and the love the creators had for it and it gets to you and you can't help but smile like an idiot, shear for the characters, get goosebumps every time Kamina does a speech, or even shed a tear or two. I really recommend it.
You will literally grow a beard while watching it. That's how manly the show is.
And everything that is a mix of One Piece and Fairy Tail has to be awesome.