Zerg and Protoss beat clones for several reasons.
Clones probably used to fighting droids whose characteristics include crappy aim, no brain, dull, crappy armor, low quality, and etc etc.
Sure, clones have training, but how long have they been trained? Are they prepared to fight enemies like Zerg and Protoss?
What about Jedi? Pssh, Force meet...Psionic. Neural Parasite? Win. Psi Storm? Win. Fungal? Win. Army of countless Zerg popping out of nowhere on your doorstep? Win. How often do you see Jedi using Force Push and other Force moves?
Do clones even have weapon of mass destruction? Death Star don't count because it appeared after Clone War. Fleet of ships, maybe. What else?
What their armor made of? Plastic?
Do Zerg and Protoss have weapon of mass destruction? Yeah, Leviathans' Bio Plasma blast, Carriers' and Motherships' Purifier, Colossus, fleet of Guardians and Devourers, mass overlords dropping Banelings high on steroid on clones, mass Psi Storm, mass Fungal, army of old Infested Marine (or clones) whose explosion is way powerful than Baneling. Oh, horror. Imagine if Zerg make old BW Infested Marine out of clones. BOOM!
Lasers! What about lasers? Well, lasers don't alway kill organisms. Look at some aliens that popped out of nowhere who hate anything artificial and love to be in pain. Happen couple years after Luke Skywalker win.
Edited by SkullCapp on 9/30/2012 9:31 AM PDT