What frustrated me
is exactly what they did with Dukat in seasons 3 and 4!
was the bit that never quite rang true for me, that seemed out of character.
I was worried they'd just water him down so much in subsequent seasons you couldn't take him seriously as an antagonist anymore.
When he announced the deal he'd struck with the Dominion I thought, "finally.
Here's the character we've come to love to loathe. Welcome back."