Re: Han Solo...(Possible Spoilers)
They're not amazing or anything but Hamill, Fisher and Ford were very good in the original trilogy. Fisher tends to get overlooked but I thought she gave the best performance of the core three.
They were adequate for the material but I imagine there were hundreds of starving actors in Hollywood who would've given equally adequate performances.
I thought Fisher was much more convincing in The Blues Brothers
"I had no idea you were so... formidable. " - Anan 7 to James T. Kirk, A Taste of Armageddon