The Guards seem "lifeless" to you possibly because they are short animations. 8 and 16 frames. Not much you can do with that short of time.
Leg sliding isn't really happening in those gifs... it's the angle it was taken, but they are stepping off the ground LL.
As for the side smash one, I copied the upper body to a tee... I spent a good 2 or more hours on trying to get that as close to what it looked like in Smash U as I could. So... yeah... Same with the Blazer one. But that one was made from scratch. The shaking you see isn't the HipN, but the Bust and possibly Waist bones. I might go back and take a look at it... but right now, I'm satisfied with what I have.
You really need to do better on constructive criticism.
Anyway. I like the new look of the side smash. It's a bit off... like the head being angled too low, the right legs rotation is turned too far right. And her sword arm being bent and her sword landing through the ground. Other than that. It looks good.
Could go do that right now. Joking aside, I know it's unrealistic. But if I were to add more key frames and do a whole getting up animation at the end... it would just take up space and be unnecessarily long. So I'll stick with this one.
Funny that you post that... I made my own as well. The ending needs to be lengthened but I got the final strikes pose down... well minus the leg... forgot about that.
Gotta still show you up. :v
Edit: Updated the animation to more closely match the Smash U version.