I play at around 30-40 ping, I'm an extremely good blocker and I've dueled other extremely good blockers and we all have the same problem.
Hits going through perfect blocks even though we're both DIRECTLY infront of each others, hits going right through shields, blocking attacks with the wrong block (I blocked numerous overheads with left blocks somehow).
Ever since the new patch servers have had a weird lag, even though I'm playing at 30-40 ping, it feels more like I'm playing at 150 ping with people phasing right through me, hits coming out of nowhere with NO animation, etc.