London and Kendrick holding the tag belts for nearly 12 months brings prestige to the titles. Switching titles back and forth makes the title less prestigious to hold.
Think of RVD when he had the ECW TV title for 23 months. That title was looked at having more value than the heavyweight title because no one was able to defeat him during title matches.
I consider Duece and Domino as a GREAT tag team. You have two really big guys that can move greatly in the ring. They have excellent in ring psych.
I wasnt able to see Idol Stevens and KC enough to judge them.
MNM was another AWESOME heel tag team. The crowd reacted to them they way they needed them too. And the reaction was not X-Pac heat.
London and Kendrick were not surviving so greatly by the fans during their singles run. In ROH, of course, they were highly respected by the fans. With the WWE having a much more different wrestling style than ROH or TNA London and Kendrick are fitting in greatly in the tag division. Sometimes in WCW and even in TNA each wrestler is going so fast it is hard to keep up with who did what move to who. WWE matches focus on selling moves much much much more.
Also, I have not heard the fans booing these two nor have I heard them say anything really negative about them.
Look at the cruiserweight division. A true cruiserweight division should be ran like it was in WCW. How often do you see cruiserweights chain wrestling and actually doing the high flying lucha libre moves that they used to do? YOu dont see that in WWE. Why is this? Simple, the WWE uses psychological wrestling to where each match tells a story. You have a clear heel and face. The one bad thing WCW did with the cruiserweights was not give them heavy weight title matches or shots. Example Jericho, Mysterio, Eddie...
HBK is deserving of another title run, but so is Edge. Edge is a big time performer who has the total package. He has the height, weight, look, mic skills, wrestling skills, in ring psych, and the so called wrestling dues.