Well, I´ll be a bit fanboyish on this one:
1st - Ruffy vs Blueno (I never read a single spoiler of OP untill this point, so I did not get influenced by that bad aura revolving gear 2nd on forums by that moment, wich means: I saw the words gear 2nd sliping from Ruffy´s mouth, I cried with joy, I went crazy on street telling everyone how good OP was and how Jet atacks were wonderfull, I cried again, I could only talk about OP for a month, again I cried, noone undestood me but I did not care, I cried my last tears of joy and died of dehydratation. Oh boy, feeling like that is so dammmmm good). PS: I even got delusions of Ruffy owning CP9 and Aokiji alone on that moment…
2nd - Ruffy vs Lucci (well, this fight is really really really good, Ruffy´s fight are almost aways the best).
3rd - Chopper vs Kumadori (Monsta Chopaaaaaaaaaa!!!!!!!!!!!)
4th - Nami vs Calipha (oh come on, nice fan service alongside fata morgana, Calipha´s stupidity, Chopper interrupting the fight and Thunder Lance Tempo making it just as good as it should have been, what else could you ask?).
5th - Franky vs Fukurou (creative, balanced, well-done, funny, perfectly timed, wich means: had no flaws).
6th - This a special entrace by......... Sogeking and Franky vs Marines and Spandam. Here comes the fire barrage you assholes of the goverment. And beware of the elephant rain.
Now for the bad ones...
7th - Sanji vs Jyabura (was short, I wanted to see a little bit more of Jyabura, and this one only got my atention when Sanji used his new technique).
8th - Zoro vs Kaku (so much hype over these two for that? Although Kaku was funny, that fight was pretty much only laughable).