...and there are bad frankenpanels...
OMG...I just had the best laugh of my lifetime!
Good Lord, there's just no reason for that... I could care less about the blue marble contact paper, but the random array of buttons of every conceivable color is just dazzling. It's alive! MUAHAHAH!
No offense, of course...
I always think of a frankenpanel as one at least 3 feet wide, with way too many controls. If the controls are redundant or totally mismatched, that makes it an even better candidate. Having bat sticks AND rotary sticks is logical enough. Having 50 buttons, half of which do exactly the same thing as the other half, is just bad planning.
A single panel with 5 joysticks, a yoke, two trackballs, a spinner, 20 game buttons in various colors and configurations, and 6 admin buttons would definitely be a frankenpanel. Whether it's ugly or not is up to the beholder, but it's still a frankenpanel.
Frankenpanels generally are better suited as standalone control panels. I built a 4 foot long frankenpanel to take to a family reunion last month because my cab wouldn't fit in the trunk... it worked great, was ugly as hell, but most people didn't care. It took a couple hours to build, and it was fun!
Frankenpanels on cabs usually destroy the look, and are generally so large that you must stand almost out of view of the monitor to use certain controls. This is where planning the layout of your controls comes into play.
The best alternative to frankenpanels would be multiple cabs, swappable panels, or even rotating panels...