Lol.
Well, in my experience the kick is no longer a tool that is used much simply because there was a stage where alot of kicking happened, but over time people became more mobile and unpredictable in movement because of the kick, so kicking now has far less opportunities to be used, simply because alot of people know from experience not to move directly at his opponent or in straight lines within kick range.
The last time I remember having the opportunity to land a kick with 100% chance is because whilst I held my shield up, some guy came at me with his shield held up and for some reason he just stood on the spot right infront of me, which resulted me kicking him then chopping down onto his head.
This could also be the result of that because kick slashing is a rather rare occurance nowadays ( atleast from what I see ) that people themselves forget they can even kick and be kicked. Happens to me sometimes, after a fight I'll realise I had an opportunity to kick and I didn't simply because I forgot about kicking, lol. Where as when the game was first around, everyone was getting kick slashed.