If you are looking at kitchen hardware (i.e. knobs and drawer pulls) you are worried about the wrong things.
What you need to be concerned about are ths things that you can't see. Did they move any walls? And if so, did they install proper headers for the loads being supported by them? Why was the house flipped to begin with? Was it full of mold? Was there a fire in the house? (Not every flip has this sort of thing but those are the ones you want to know about!)
Structural issues are the issues that will kill you. If there are structural issues just walk away.
If you can determine that there aren't any major structural issues, then you can use the crappy kitchen knobs to dicker on price.
