I found this the other day on YouTube, and I laughed.
It should be noted that Might Gaine is considered the "other" Brave Robot series worth noting, primarily because it is the most dramatic and darkest. According to critics, it is "generally considered the best" of the Brave series. It certainly seems, from this clip, to be the most self-aware, as it is parodying its own genre here.
Apparently, this is how you top the best theme song:
Note that I'm not really much of a fan of what I've seen of GaoGaiGar Final because of the change in animation styles, but this was apparently the modified Final theme, and I quite like it.