well, for now I will comment on your first one...
the jump: he could have taken a longer time to crouch, it would seem more dramatic. but you dont really have to change that. when he jumps up into the air his arms should shoot backwards almost straight out, his head should look up, and his back should arch backwards. all these things add power and drama to the jump. you pretty much have easing down though, i liked the slow-motionish part at the highest point of the jump.
the reaction: well, first of all the spike should slow down slightly as the stickman absorbed some of its momentum. also, everything should go away from the point of impact, like this: http://pivotup.com/files/h8gxny7r.gif
as the origin drops down, the back and legs go up, dragging behind the stickman as he falls. you did some of this, but it wasnt dramatic enough. you should have unbended the legs.
on the ground: the only thing i have to say is that the way the spike fell sideways was really weird. what you could have done was make it bounce up and to the left right after it hit the floor and then maybe fall behind the stickman or whack him on the head. and for dramatic effect and realism, you could make the legs and head bounce once while the origin is still pinned to the ground. remember, they hit the ground faster. one last thing: if you want him to be on the black line make sure his feet never rop below it, as i saw happen often in all of your anims. if you want him to be below the black line, move him down about twice the width of his head, it will look more 3d.

i guess you will notice that i only said bad things here, but everything i didnt mention you did a great job on. everyone else already said the good, i was just trying to give some helpful criticism.

Lol make the lol the way you say "gotta love the criticism" makes you want to rethink and read what sumfink wrote again lol. Sorry oft

glad you appreciate it, i was wondering when you'd check this thread if you want i can CC some of your others. for now, 2 things i noticed- foot placement was really screwed up in all of your anis, they often dropped below the line. also, you always have the arms tightly folded against their bodies, it will look cooler if you change that sometimes. i guess it kinda seems to be your "default" position for a generic fight or something. hope this helps!

oh, you dont? oops. guess i'll stop then. do you animate at all?

ide say low inter

You belong in rookie, your animations are far to stiff, reactions are bad, Physics are bad, and your shakey.

Boarders u are not average yet, shakey...