While there are table extensions for Quark, including what's included in Quark 5, I don't think any of them directly import from Excel. (I'd be glad to be wrong on this.)
Usually I export the spreadsheets as tabbed text, then import them into a Quark text box.
The graphs, as P20 mentioned, are kind of useless for printing, but those workaround will (kind of) work, with unknown friendliness when you go to output, depending on what you're feeding it to. I almost always rebuild graphs in Illustrator so I have more control of color, line weight and fonts.
Simple bar graphs could be built in Quark (drawing boxes), if you have the data. I've even scripted a few solutions that way. And Illustrator is now scriptable, but that functionality doesn't extend to the graphing module, so you would have to write a script to draw primitives such as bars and pie shapes.