Great thread.
GSP-Hendricks: GSP 1,3,5. 4/5 rounds of that fight have a clear winner, but round 1 was close and could have gone either way. I bet money on GSP and was confident at the end that I was going to win. Like I said, I can see how round 1 could be scored differently, and it wouldn't be an outrage either way. GSP correctly won under the 10 point must system though.
Conor-Nate II: Conor round 1, 2, and 4. Don't even see how it's debatable. Nate had a surge in the last minute of round 2 in which he didn't actually connect with many clean shots whereas Conor dropped Nate 2 or 3 times and soundly out-struck him up until that point. He was doing good in round 3 until getting Teed off on (in which Nate landed some good shots, but never rocked/stunned/dropped), preventing that from being a 10-8 round.
Rampage-Machida: Machida rounds 1 and 3. Although rounds 1 and 2 weren't very eventful, Machida's leg kicks were the only strikes of any significance that landed in round 1. Yes, Rampage was advancing, but I'd rather retreat from Rampage than get kicked in the leg by Machida. Believe Rampage landed a decent punch or two in round 2 that swayed it in his favour (in my eyes).
Lawler-Condit: One of the closest fights on this list. When I watched it live I thought Condit, when I re-watched I thought Lawler. I'll have to watch it again someday and update this response.
Gus-Jones: Gustafsson is my favourite LHW and I really don't see how he could have won. Pretty clear 2, 4, 5 for Jones. I did score the DC fight for Gus, but that's neither here nor there.
Condit-Diaz: Condit 3 rounds to 2. Same reasoning as Machida beat Rampage (imo). I would rather walk away from Nick Diaz than get kicked in the leg by Carlos Condit.
BJ-Frankie I: Edgar. This was right when I was getting into MMA, and the only previous time I'd seen Penn fight was when he mutilated Diego Sanchez at UFC 107. I'd never heard of Frankie Edgar, and me and my friends thought he was gonna get smashed. Boy, were we wrong. Competitive scrap for sure. My one buddy I watched it with was a huge Penn hugger (and the reason I started watching MMA), and even he thought BJ was gonna lose before the decision was read. BJ clearly thought the same thing, and we were all right. I'd rank this with Lawler-Condit as being the closest fights on the list, but their subsequent bouts left 0 doubt as to who the superior fighter is.
Shogun-Machida I: Shogun, but by a way narrower margin than everyone says. Would be a good one to watch again. I remember watching it a 2nd time and understanding how Machida got the nod.
GSP-BJ I: Just watched this fight. It doesn't belong on this list. Ridiculously cut-and-dry rounds 2 and 3 for Georges. Even round 1 is way overrated for BJ. Penn was out-boxing him at first and landed a grazing punch just on the tip of GSP's nose that broke it. GSP took control at the end of the round finished it on top. Next two rounds really weren't that competitive (especially the 2nd), with GSP doing his thing and controlling/dictating all of it. BJ was tellingly dejected after the fight, and Eddie Bravo (who UFC had score fights for the audience at the time) had GSP winning. The one and only judge who scored it for Baby Jay? None other than Cecil Fucking Peoples.....the same clown who mystifyingly scored the first Penn-Edgar match 50-45.....tells you all you need to know lol.
EDIT:
@XThe GreatestX thanks for a refreshing and actually interesting thread. A person could easily make a couple more volumes of this. Who did you score Whittaker-Romero II for? Curious cus I agree with most of your assessments other than a couple glaring exceptions (BJ-GSP I, that's a really puzzling one)