Okay, let's see what we have here... I'll list them in the same order as you did.
1st: Definitely not stiff, but it is rather slow though. I liked it, but not that much...
No doubt the best of the bunch though.
2nd: Ugh, the stiffness! It's slow, it's stiff and very symmetrical. I do admit that
the way you decapped Uke surprised me a bit, but overall, didn't like this.
3rd: Hmm, not too much to say about this one. You were relaxed to begin with,
but the attacking part wasn't too good. I lol'd at the balance though.
4th: This one definitely has some potential, but unfortunatly, i didn't see what
i would have loved to see...
5th: Oh god. I'm sorry to put it like this, but rarely do i see this stiff a replay.
I do not like to put it like this, but it was kind of failful, like you said yourself ._.
First one deserves a score for itself, a 6/10, but the rest gets a collective 3/10.
What you really need to work on is the relaxed style seen in the first replay.
When playing relaxed, stiffness is pretty much eliminated, and symmetricality
becomes very impractical, forcing you to go asymmetrical, which is a good thing.
Though if you are a beginner, these are pretty good.
Also, sorry if i seem very harsh, but i believe that criticism shouldn't be "diluted",
so to say, regardless of who has made the replay. But keep in mind that i'm
trying to help you become better, aye? ;)