Honestly? No, your animations have a complete disregard for all of the requirements for being good at pivot. To start with where is the easing? Shouldn't there be some somewhere? I see some bits and pieces but there isn't enough to make it look completely smooth. They are all extremely stiff you don't move every limb in every frame like you should to counteract that, if you just move most of them then it still won't look like it has any life to it. If it doesn't look alive than why do we care if it gets maliciously smashed by a ball? We don't. Physics seem to not exist to you, why does that guys leg just bend backwards, it doesn't make any sense at all. Though frankly who cares is a good argument for that, however I still don't think that they should be doing ridiculous like that. It also seems like your spacing isn't very evolved to deal with situations like falling or being hit, it just seems like they fall in zero gravity it is absurd. Also realism, Though I dislike being one of the people to hypocritically point it out it does need to be there even if you don't want it to, if it doesn't look real then it doesn't look as good. Though if you can make an unrealistic animation of the same level it can look just as good.
Easing is the most important one for you to work on, it makes it flow better and have a better look to it. Though this doesn't occur in real life it does help make it look realistic. Though you're animations don't look choppy they also don't look that smooth.
Stiffness, this is one of the hardest things to break free from. The easiest way to prevent this is to just practice moving everything always. If you manage that than you should be able to reduce the stiffness in no time at all. This goes hand to hand with easing they are the most important things to learn.
Physics don't seem to apply to any of the animations to much, example: "if a guy is falling at the speed of a feather and he dies when he hits the ground." why would we care if he died? We wouldn't because that makes no sense. If he falls from a large building and goes terminal velocity then gets pancaked on the ground then it builds a sense of suspense. It get us more exited and is more entertaining.
Realism is hard to describe but it seems like if you don't have it assholes here will manage to bitch about it every 2.1 seconds because they have nothing better to bring up like ****ing retards. If you are good at the three above than it is likely that you are going to be good at realism. Just practice and experiment.
Overall I give you a decent medium begging rating, you have potential though so don't give up. If you get down easing then you will be pretty much high beginner, But that doesn't mean that you should neglect all of the others as well. I also recommend not doing any effects until you are good at rudimentary movements and reactions that way they will look better with some kick ass effects later one. Also it would please me greatly if you did more action in all of them like running more jumping ect.
Abyssal.