How often do you have to go around?

In simulation, the simulated ATC seems to be very inefficient at
spacing aircraft, because practically every fifth aircraft on landing
is told to go around. In fact, if you are told to follow someone in
for a landing, you can take for granted that he won't clear the runway
in time and you'll be told to go around. It's tiresome and
frustrating after spending a lot of effort to line things up nicely.

How often does this happen in real life? I should think and hope that
real controllers can space aircraft better so that it's rarely
necessary to abort a landing.

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