We've pitched on a hard standing several times.
I don't mind it (especially if it has been or is forecast to be very wet) : it makes for fewer muddy ground sheets.
Hard standings vary enormously tho, (one was tiny pea gravel, and another was huge lumpy stones which were a bit painful on bare feet in the middle of the night!) and I do tend to use an old ground sheet on hard standing, to protect our decent groundsheet.
My OH doesn't like it at all (he thinks it's not really camping) and prefers grass.. puddles and all!
We use rock pegs quite successfully on hard standing, though a hammer rather than a mallet works best
Just back from Glencoe club site,tt's only allowed on hard standing there. Personally,I prefer grass,but if it's a choice of hard standing or not camping,then out with the rock pegs. We use the plastic topped rock pegs when on h/s
and tarzan pegs (like t bar 9 inch nails) for the mud flaps. Be aware though that some sites hardstanding can be a concrete slab,best check. Where are you going may I ask?
------------- Silence is golden
Duct tape is silver
All weather pitches are nicer than hard standings as they're designed for tents to use too. Been on both with no problems though. I Used rock pegs for mine. I've got a breathable awning carpet rather than a groundsheet which is nicer on the feet.