Matter of preference...
My husband met my parents on our first physical meeting on our first date before we were married... I think he handled himself quite well...
Before I was married, I had a bad habit of picking lusers, so if I did not want to be used, I'd have the guys meet my parents. If the guy acted out of sorts with my folks, they would let me know immediately and I would get pulled out of getting into a nasty situation...
I did not meet my husband's folks after we had our official JP ceremony. I met his dad on the way to our religious marriage ceremony and his mom the day before the ceremony...
So much for how soon is too soon...
And we are past the 2 year mark!!! Yay!!!