I feel like this review page is being swamped by Robin Hood afficionados and movie geeks that are all taking this film way too seriously... This is not historically accurate at all and it's not Robin Hood as you might expect. What it is is a nice action flick offering entertaining action scenes with solid archery combat (if you've ever seen this youtube video of a guy showing how archers actually fought, it seems the makers of this film were paying attention).
If watching the bloke from Kingsman shoot arrows into bad people sounds like fun to you, go watch this movie. If you're a history buff, go to a museum or something. It doesn't reach the heights of Kingsman, and there are some plotholes (such as Robin having the opportunity to end the whole thing by killing two people he's alone in a room with... no idea why he didn't), but if you can look past it there's plenty of enjoyment to be had here.