I would argue that GSP isn't a streaky fighter. Serra landed a lucky shot, with his heavy hands, that would have put anyone down. It wasn't as though GSP was being outclassed the entire fight, in fact he was winning the fight until he left an open shot that put him down.
...I wonder if Tito will beat Machida. Machida is no joke, and Tito has been coming into the ring as a joke. I really hope the Tito of old makes a reappearance, since he claims he has 5 years of fights, in him, left. Hopefully he'll want to put on a show so another organization will be even more motivated to pick him up, then just based on his namesake alone.
...I love sherk because he's an animal, but if Penn comes into the ring in the best shape of his life again, he is such a technically sound fighter that he can overcome most strength issues until he tires out. He's one of the few cases where technique just works raw power, until physical conditioning takes over and he can't maintain his technique or endurance. I'd like to see Penn come into the fight with another solid 5lbs of muscle on him. His physique honestly didn't look that great, overall, coming into the ring last fight, I walk around at least that lean on a daily basis with slightly more mass, but it was the best shape I've ever seen Penn.