Overall, I can except it, though. Always loved all three movies as a kid. It also adds some good, albeit brief, romantic tension between Leia and Han in ROTJ. Han definitely needed that for a little character development.
Thanks to CO and Zombie for the good discussion below. I didn't know the actual history behind all of this until now.
It was also kind of weird how Lucas had Vader say in the midst of his fight with Luke "Your feelings for them are strong. Especially for... Sister! So...you have a twin sister."
"...Sister!"? Who would talk like that? Sounds forced. It's nowhere near proper English. I had heard a story that the actors didn't even know what this revelation was until they were on set. The nonsense makes so much more sense now knowing how fly-by-the-seat-of-his-pants Lucas was with Episodes 5 and 6.
But, of course, it doesn't take away how cool I thought the trilogy was as a kid.