Throwing leg kicks until your opponent is limping and then never throwing one again for the rest of the fight.
Agree 100%. Cerrone brutalized Nate's plodding front leg in the first round of their fight, and then just stopped kicking altogether for no reason, and ended up losing a boxing match to him for the next 2 rounds.
My pet peeve is fighters not realizing what made GSP so good at MMA and trying to copy it. I'm not saying it's easy (it's not) - but what he did best was mix up strikes and takedowns so that he would set up a takedown with a feint (and conversely, fake a takedown to land a strike).
For all of his highlights (superman punch, armbarring Hughes, pummelling Fitch, knees to Serra's body), what was fundamentally great about him is that you never knew if he was going double-leg you or jab you, and he was excellent with both.
Heck, he won the Koscheck rematch (and derailed Josh's career) with just a jab, and used the same jab to stay safe on the feet against Shields (even after Shields eyepoked him into Bolivian).
Worst examples of how not to do it was Maia in the Woodley fight - shooting the same telegraphed takedown with no set-up, and (most recent) Blanchfield doing the same against Santos.