I dunno why people are bashing poor (well not really) AD... Yes, he's gonna seperate JB, but ultimately he's gonna be the one responsible for bringing them back together as well...
As for RR's act... I'm enjoying it thoroughly. He's an extremely competent actor, and quite like his completely egoistic and selfish act. It's different from Mr. Bajaj, and thats good, coz I wouldn't want him to repeat this same character everywhere. For everyone who has been saying UDs over the top act was better, the characters they're potraying fall into different categories, both age-wise and otherwise too... UD was more a bad boy than completely full of himself...
And as for comparisons between RK and RR, I don't think its fair. It's the KS forum, and of course mostly everyone here is a fan of RK... But be courteous, RR is a fantastic actor too... And be happy, at last there is an equally strong (to RK) actor joining KS... It'll only make the show better....