#4 Jeff Jarrett (didn't regret joining WCW)
Jeff Jarrett is one wrestler who can't complain much about his run in WCW. A mid-carder at best during his WWE stint, Jarrett was heavily pushed upon his arrival in WCW, and he went on to become a 4-time WCW World Heavyweight Champion.
Jarrett was nothing more than a mid-card act during his WCW stint in the mid-90s, and left the company to join WWE, while Nitro was dominating RAW on a weekly basis. In an interview a while ago, Jarrett reflected on his time in WWE and WCW, and stated that when he moved to WCW, he was getting the opportunity to not only be on the majority of the TV shows, but also house shows as well.
Jarrett left WWE for WCW in late 1999, and the timing of his arrival couldn't have been better. In a few months, Eric Bischoff and Vince Russo rebooted the entire company, in an attempt to push new blood. Jarrett was one of the stars that the duo wanted to push to the Moon. He went on to defeat DDP to win the WCW World title.
Over the next year or so, Jarrett won the belt three more times, registering victories against the likes of DDP and Ric Flair in the process. Following WCW's demise, Jarrett went on to form TNA, and the rest is history.