1) Luffy-No need to explain.
2) Zoro-After the time-skip, Zoro is invincible, almost. He has a sense of direction now, his swordsmanship has been refined, he knows haki, and he can fight Tashigi. An overall monster. Even before, he's a great vice-captain and the most serious. While he may seem like an idiot, he's always held the crew together and been the serious one (When they were waiting for Ussop's return, when he was scolding Chopper at the Davy Back Fight, when he was telling Luffy to be cautious and serious, etc.)
3) Sanji- Sanji is pretty darn strong now, and really fast. He's got great mobility with his Geppou and Blue walk. Plus, he's gotten stronger and faster. Faster than Zoro. Also, he uses his brain, which makes him a dangerous opponent (like the opening of the Gates of Justice.)
4) Franky. Franky has always been really powerful. He's got his long ranged weapons, like "Weapons Left," Fire breathing, "Franky Radical Beam," and "Coup De Burst." And he's also strong in Melee, "Strong Right," etc. He's got cheap, dirty tricks, (Like the centaur and the pursuit cannons, as well as the General Robo,) And plenty of machines to use, like the Rhino Bike, Brachio Tank, General Robo, etc.
5) Robin. Robin's skill is actually really powerful. She can practically teleport, make clones, fly for short distances, and spy on others. She has infinite range, almost, and can hurt the enemy from anywhere. If she was physically stronger and faster, she'd be really powerful.
6) Brook. Brook's pretty mobile, with his light jumps and his walking on water. His new ice blade is just awesome, and makes his humming blade and arrow notch cuts so much cooler and stronger. His soul thing is really cheap, allowing him to past through things, spy on people, and communicate from afar. His music is useful, and can dissuade the enemy from fighting (making them fall asleep or party.)
7) Chopper. I'd have to say Chopper is stronger than Ussop because he's pretty versatile. His Kung Fu point is pretty fast and strong, while his Horn point is useful as well. His Heavy point is really powerful, along with his Monster point. Overall, he's a pretty good all-around fighter, just lacking range. His brain point is useful, for finding enemy weaknesses.
8) Ussop. His new Pop Greens are useful, and have a variety of effects, making him pretty versatile too. However, we haven't seen as much of him fighting after the time skip as Chopper, which is partly why I ranked him lower. Most of the times he's hiding and bragging and running away. Lol. But I think one advantage he has over Chopper is that he's a strategic fighter, and has range. For example, his trap against Daruma.
9) Finally, Nami. Sadly, Nami's last on the list. Her Climatact is useful, but she's physically weak and slow. She's actually probably one of the more destructive and area-damaging SH's, with her powerful lightning strikes. However, she's more useful as an informant and navigator than a fighter. All we've really seen her do after the time skip is blast people with lightning clouds or lightning lances. Her fighting style is very interesting though, the whole weather control thing. For example, her Gust Sword was one of my favorite moves.
You trollin? 
