Even though I'm pretty down on all WWE brands there are still wrestlers whose work I really enjoy.
RAW
John Cena - like others have pointed out he has improved dramatically over the last year or so thanks to his feud with Edge. One of the best promos as well when he's not hindered by the "writers" giving him shit to say on TV.
Umaga - old school monster heel and a great carrier of the wild/savage samoan tradition
Edge - the future of the WWE, especially if Hunter isn't able to come back from his latest injury (unlikely but you never know)
Cade/Murdoch - such wasted potential but whenever they are on TV they are always entertaining, I hope they get sent to Smackdown soon
Smackdown
Fit Finlay - just an outstanding wrestler even at his age and someone who shows that less is more, he doesn't do any flying nor does he cut any super-intense promos. He just goes out there and beats the shit out of people. And anyone who can take a midget and make him a positive instead of a negative is a genius
Regal/Taylor - what needs to be said that hasn't already been mentioned before
Gregory Helms - JBL nails it on the head when he calls Helms SD's best kept secret. If the old ECW was still around Heyman would have pushed him to the moon and he would taken the ball and ran with it. Helms is a complete package, he knows how to work, cut promos, everything
Kendrick & London - WWE's best tag team in the last 5 years
JBL - wrestling's finest commentator, he knows what and how to get things over. Sure he sometimes buries guys he doesn't like but usually the guys he buries I don't give a shit about anyways
ECW/TNA - stopped watching both
ROH
American Dragon
Nigel McGuinness
The Briscoes
New Japan
Hiroshi Tanahashi
Koji Kanemoto
Naofumi Yamamoto
Manabu Nakanishi
NOAH
KENTA
Yoshihrio Takayama
Takeshi Morishima
Akira Taue
SUWA
All Japan
Minoru Suzuki
Voodoo Murders
Kensuke Sasaki
Dragon Gate
Masaaki Mochizuki
Tozawa-juku
Zero-ONE Max
Ryouji Sai
Kohei Sato
Daisuke Sekimoto