I recognize the problem, for the first time people actually acknowledge it it seems. I have been ridiculed so much, whenever I said that it went right through my held block without outangling me. I have even experienced me holding an upblock, then it changed into another block without me releasing RMB.
Also, some days I can block fine, my feints feel responsive, and everything feels smooth. Other days I keep getting hit while I actually click on time, but my character is just slow to respond to my clicks. I can actually see it when I just block, the block animation begins noticably later than I click. I should have a pretty stable connection, so I think thats serverside. My ping is almost always 30 ms, and I doubt thats causing it.