I agree with some points. Khushi is adorable, but I do wish that they didn't always show her making mistakes and being a total bimbo.
Like one minute she's all determined to get a job, and next minute she can't remember the right name of the right house she has to go to... but at least it's better than the always-crying main leads!
I really wish they showed more of Arnav, and his "raaz", his childhood, his motives, etc. As you said, the first few episodes raised the bars on those, and showed a lot of ArHi, the next week, it's like, "What...?"
I wouldn't say the show is completely slow though. It's been 2 weeks and a lot of stuff has happened! It takes forever in shows for the main leads to meet, but they met from the first episode! We've seen more of their meetings, Khushi moving to Delhi, etc. It's pretty fast for the start!
I find the Mami and Buaji funny at times.
However, sometimes it just seems like they're trying to waste time, and it's totally boring, and the scenes are unnecessary. And sometimes it's just plain annoying! The goat bit was just random! Not funny at all!
Coming to Shyam. Looks don't define talent. He seems like a negative character so far, and if he's already making you hate him, I guess he's doing his job well! How do you know the actor has no personality... I don't get it.
As for the character, it's too early to judge.