If you like the other Warriors games then I think it's worth getting. It is a little different in a few ways but the fundamentals are the same.
I've enjoyed it, the secondary objectives are not to easy, not too hard but keep me playuing on the harder Difficulties. Combat is less outagous and more realistic than other warriors games but I feel it fits the style better like that.
I would certainly play a sequal. My only real complaint is I would prefer a few more of the characters in it to be playable, even if only in free play. Also, the movesets could be a little more varyed.
Just my thoughts.