When i first saw this show i too thought, like so many others, it was going to be really lame. First of all i'm from Europe: i didn't know Keke Palmer. After watching a few episodes this show grew on me.
Like many have already said the cast has great chemistry. The writing isn't always "outstanding":quite an overstatement there lol! But what keeps it together, for me, is this wonderful talented cast.
When i look back at Kenan an Kell or a corny show like Saved by the bell (yes i'm from that time period and yes i loved it!) what was it really about? The stories at times (or most times) were not that good: It was meant to make you laugh, and laugh i did!!
So I do agree the writing needs to improve when it comes to the jokes/storyline. But i don't think that this show is really THAT bad in comparison to other shows (i-carly,big time rush,sonny with a chance).
Conclusion this show (for me) does what it's supposed to do: have children/families enjoy themselves for thirty minutes or so nothing more nothing less!