I believe the idea is that Heaven was not so great. Because there was no free will so all the love that existed... wasn't really love.
Only through creating a being with free will and exposing them to an entity of hate and selfishness could he create love, which is better than perfection.

What I don't get is why God plans to punish the creature that he made become evil manifest. Lucifer, being an angel, could not have had free will.
Oh well... I suppose it's willing suspension of disbelief.

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"Man lives in the sunlit world of that which he believes to be reality. But unseen by most is an underworld, a place that is just as real... but not as brightly lit... A DARK SIDE!"
-opening from Tales From the Darkside