I'm pretty ignorant to the Robin Hood legend, and so, unlike... say... Ebert, I won't be comparing it to the wittiness of Erryl Flynn or anything along those lines. This really isn't a fun film. There are moments where you'll definitely smile, though. However, general tone is that it's very serious, and it's also very methodical in pacing. There are maybe 5 "action" scenes in the entire film, and 2 are really early on, while 2 are at the end. Whether you enjoy spending time with the characters, and letting things develop, will likely determine how much you like it, while I enjoyed the film overall a great deal, my wife hated it and slept through the last half.
The problem, for me, was that when the stakes were risen, and we got to the big action scenes and big emotional payoffs, it didn't hit me as much, and was my least favorite part of the film. It went from a 5 star contender downhill pretty quick. I still thought that 80% of the film was pretty brilliant, and that's enough for ****