I have now seen this twice and I really like it. Jon and I saw it first and then I made my three oldest boys (ages 11, 13, and 14) study up on King Richard the Lionheart, King John, and Robin Hood, and then I took them to see it on Monday. It was fun to do some reading in advance of my second viewing. I learned some stuff! Hopefully the boys did, too.
I love the relationship between Robin and Marion. It's sweet and slow, a nice change from the usual Hollywood fare, even though the circumstances created in the script might have justified the usual quick leap into bed. (She's been without her husband for ten years! He's been fighting wars for ten years! And they're supposed to be acting like husband and wife!) Also, I like Russell Crowe and Cate Blanchett.