Alright, I can't rate this too awful highly because the quality could use some work, so instead of rating it, I'm just here to offer you some pointers. (I've done this before, hopefully you'll actually listen to me though.)
The animation quality isn't too bad, it feels a little "direct" per-se, that is, in some areas it lacks the slow-down & speed-up of real motion and movement, these are the principal of ease-in and ease-out, also called several other things. If you're having trouble with animation, I highly recommend checking out The Animator's Survival Kit, I have the actual book personally, but you can also get it as an e-book if you prefer. It will teach you all about animating, from understanding the principals and methods, to helping you focus and understand the thought process of animating.
It also needs sound, there's ways to handle sound in flash if you use that, but some people prefer to export and then handle sound with something else like Premier, or Vegas Pro. Blender also has a VSE (Video Sequence Editor) and can export to all kinds of widely used formats, there's also Olive, but it's still in alpha.
If you don't do it already, animating madness in flash is much easier if you separate the character into layers, I started out by animating the head, body, and feet on one later, and each hand on it's own, and then slowly transitioned to animating the head, body, feet, hands, blood/muzzle flashes/bullet casings/etc, and anything else, on it's own layers.
Also make sure to let masks do the heavy lifting where ever you possibly can, just right click a later and check "mask" and anything nested within it is clipped to whatever shape is on the mask layer, they are EXTREMELY POWERFUL for all kinds of situations. You might also use a v-cam, or if you're using a newer version of Animate, the integrated camera tool.
I hope this helps, but I can't stress enough that you PRACTICE A LOT, it took me a full 4 years of animating to get "good", I've been animating in flash for 7 years now. Depending on how often you do, you might advance faster than me. Stick with it, you can do great things if you keep practicing.