Bad design in Star Wars is not just limited to stuff; evolution here seems wacky, too. Three choice bits:

Sarlaac
A monstrous yet immobile creature who lives in an exposed pit in the middle of a lifeless desert, waiting for large animals to apparently feel suicidal and trek out to throw themselves in? Yeah, not so much. Not every Sarlaac can count on an intergalactic mob boss to feed it tidbits.

That Asteroid Worm Thing in Empire Strikes Back
So, large space worm lives in asteroid, disguises itself as a cave and waits for unwary spaceships to fly by so it can eat them? Makes the Sarlaac look like a marvel of natural selection, it does.

Midi-Chlorians
Oh, man, don't get me started. Except to say this: If in fact a high concentration of midi-chlorians is the difference between being a common schmoe and being a dude who can Force Choke his enemies, the black market in midi-chlorian injections must be amazing.

Star Trek fans, don't get smug: I'm going after it ne