This isn't meant to be demeaning, insulting, or anything of the sort. Simply genuine advice that I hope you take, and remember, for future reference.
The animations are obscenely slow. The attacks have no weight to them. Imagine that creature in the room with you. Ask yourself, "would those attacks hurt?". The walk animation is much too slow, and the hip doesn't move at all. Walk back and forth, at the pace you want your model to go, and note the motion of your hips, and how your legs move and bend with each step. At the very least, the model should bob up and down, side to side, ever so slightly.
For now, this is all the advice you really need. If you need examples, I'd suggest you study the models in this list:
Model Viewer | HIVE
Model Viewer | HIVE
Model Viewer | HIVE
Model Viewer | HIVE
Model Viewer | HIVE
Model Viewer | HIVE
Model Viewer | HIVE
Those are some of my favorites, both for their attacks and walk animations. I'm looking forward to seeing what you learn from these.