I wish people would stop comparing Rousey to Lesnar. Lesnar has, whether you like it or not, a rich history in Pro Wrestling. He has been WWE Champion before he went to the UFC. He wrestled in New Japan after leaving the WWE. Went to the UFC AFTER his stint in NJPW. He was actually BETTER now than he was in his first stint in the WWE. Couple that with a true amateur wrestling background, and you can see why Lesnar is believable in the ring.
Rousey is an Olympic Gold Medalist in Judo. Yes, she won the UFC strap. Her last two fights Rousey was completely destroyed. Other than that? Nothing. No Pro Wrestling experience whatsoever. This means she needs to learn from scratch. That is the scary part, because I fear they are going to strap a rocket to her back because of her UFC history. That would be a mistake. In reality it would also be an injustice to WWE AND to Rousey. Send her to NXT. Train her right. Let her go under Sara Amato's wing. Let Rousey wrestle people like Aliyah. Let her work her way to the Main Event. If she does well, then the money and effort will be well spent. If she mails it in, then it won't. But, a rocket strapped to her back is NOT the answer.