Shahrukh Khan was really good in KBC!Yes, I know, that it is too early to judge, but Shahrukh Khan yesterday was more personal, dry witted, sarcastic and peppy.But seriously, there is a lot of difference between the way Amitabh conducted it and Shahrukh conducts it.
Infact there were two instances when I actually felt like laughing.But sometimes, he overdoes what he is supposed to do. But I guess he'll soon learn it.
But the reality check of SRK as an anchor, on KBC. Shahrukh Khan speaks VERY fast. There is a lot of English , when he talks , but thats okay, unlike Amitabh who preferred to use Hindi with a lot of Sanskrit in it (eg. avashya, parantu, kintu ).
Here is an article describing SRK's tactics.