Dark Legends is...well, not the best, but it isn't too bad. My only problem with it would be the feeding. You can feed on any enemy in the game(maybe some cannot be fed on, but I haven't seen them), only not whenever you want/need to. You have to fill up a 'rage' bar first - which gets you killed quite often if you are low on health.
Oh, and the Health bar goes for that, and your bloodpool, essentially. So using any of the abilities drains your health(although once it is low enough they cannot be used).