Well, I can tell who has the fan clubs and who has the hate clubs here. But I'll leave my own judgments on player performances to fall out here.
First half we came out quite aggressive. Very Roma-like even. Roma looked pretty flat-footed. In fact, for the whole match they seemed rather uninspired. Totti was generally a ghost, Mancini couldn't do his usual damage, Taddei got shut down by (Holy Moli!) Molinaro of all people. In the first half we created more and better chances, IMO. Props to Ranieri for playing the trident.
On the negative side in the first half, I lost count of how many times we were exposed with inferior numbers on the right flank in Zebina's area. For one, Zebina was often not there. For another, Roma would double up with 4-5 attackers and we'd have 2-3 guys stranded out there. Horrible exposure, and we're lucky that it didn't burn us.
By the second half with the one goal lead, we took our foot off the gas. Roma dominated possession, and for about a 25-minute span, we seemed content with that.

Sure, we put up a 4-4-2 with the subs to replace the trident, but it took a good half hour before we thought of at least creating a decent counterattack to keep them honest. We gave up endless corner kick after corner kick. But the ref wasn't helping either -- in the second half it seemed he was awarding practically every foul in Roma's favor.
The defense held up. Shockingly, since I would have thought we'd needed at least two goals for the three points.
In the end, a lot of negatives in the game, but more positives, IMO. This is perhaps the first time we played truly worthy, elite competition and looked worthy of the victory (even if Roma didn't look worthy of anything last night).
Buffon - 6.5 - Didn't have to do a ton, but made some key saves (some of his best didn't even count -- for kick-outs by Legro or late offsides calls for a deep shot by De Rossi).
Zebina - 6 - Generally played a smart game for him, which is usually the best we can ask from him. Made the right safe plays in knocking the ball out. Held up to his defensive challenges. Move the ball forward, but as often is the case, couldn't creatively do much with it once it was there. Less upfront movement than Molinaro too (but it's not his fault that Molinaro is that much younger and can cover the length of the field like a puppy.) And here's where I might differ from others: he also had a hand in the zonal defensive errors in the first half that totally exposed us to the right of Gigi. We were lucky not to get smoked by his positional absence (he essentially "pulled a Molinaro" a few times).
Legrottaglie - 6.5 - Generally good form from the back. Didn't allow much to come through center. Maybe his kick save after DP's goal was more than a bit risky, but perhaps less risky than letting the ball through and hoping a diving Gigi would be able to put a stop on it.
Chiellini - 7 - Our whole defense plays better when he's back there. Great command of the ball and faced down anything that came at him.
Molinaro - 6.5 - I thought he played a solid game on defense and did little offensively. Defensively, he was consistently winning balls from Taddei and frustrating him. Dare I say, he almost owned the guy today. I didn't see any defensive mistakes either, other than one where he fouled to ensure it wouldn't get any worse. Upfield, again a lot of ball movement but not enough delivery. He laid more crosses than others in the right part of the field, but was completely unaware that his teammates weren't there at the time. There's some coordination issue here. But as bad as he is upfront, it could be worse: he could be Zebina.
Camoranesi - 6.5 - I can't put my finger on it, but there's a dynamic to the ball flow in midfield that he really helps. And it showed today in the first half.
Zanetti - 6 - Workmanlike day for him. Needed to do a lot more in the second half to win balls and get us back in possession.
Nedved - 7.5 - The guy played like he was five years younger for as long as he could. He pounced on balls, won balls in midfield, and consistently sent our boys running the other way towards goal. His heads-up play resulted in the foul that lead to DP's FK goal, and you have to believe that we should have scored if not for the foul. A real engine out there.
Iaquinta - 6.5 - I love how this guy chases down balls with breakneck speed. In the first half, his sprint to keep the ball in bounds and ultimately win a nice FK for DP near the box at the goal line was a fine example. And that finish on Trez's nice assist was unlucky.
Del Piero - 7.5 - Even though I scored Nedved at the same level, I have to give him MOM for what he has done for the victory. Yes, many of his crosses were even poorer than Molinaro's at times yesterday (no exaggeration folks -- take the rosy sunglasses off and watch the tape). But when he lined up for that FK, you just knew something was up. And he was gold. Good as gold. In the end, he made the difference in this match. And while much of his sacrifice was winning fouls, defending his heart out, and not being as creative as he has been in some games, a perfect captain's performance for such a big game.
Trezeguet - 6.5 - This guy is always controversial for points when he doesn't score. But he only gets a few seconds with the ball in a match. IMO, the team didn't do enough to get it to him. His best touch was the heads-up assist to Iaquinta. But his other touches were very productive as well. If you were to look at the productivity-per-touch ratio, he probably still lead the team yesterday -- just that the touches were few and far between.
Subs:
Nocerino - 5.5 - Didn't add much at all to the game, and the tide of the whole match shifted when he came on. Partly, I blame Ranieri for that because the guy is so much less effective on the right wing than when playing more in the center. But he really didn't look match fit today. Still, I won't call for his loan.
Sissoko - 6.5 - A bit punishing at close range, but I liked that. Aggressive in his challenges. Won balls and dumped it off.
Palladino - NR - Not on long enough.
Coach:
Ranieri - 6 - Big points for the trident, the team he started with on the field, and for winning a big match against big competition. Negatives for trying to defend a 1-0 lead on Roma, and for putting in Nocerino in where he was asked to play on the dreaded right side again and it almost cost us. Nedved was a needed sub, but I though Trez should have been left on.