I'm okay with nudges interrupting blocks. You simply trade away your own ability to block and attack to deny the same thing from your target, fail at this and he might get a free hit on you. Succeed and on 1v1 you win "nothing" (character collision is fucked during the nudges, so you might be able to walk through your enemy and hit him in the back etc, and they may panic and fail their block because of the nudge).
But IMO reduce the block-nudge's (all melee weapons that have one) knockback (or risk, by increasing the nudge duration). Nothing more frustrating than chasing an archer, he pull out his sickle, blocks once, slaps you in the face with his left had, you fly 15 meters backwards and get shot in the face. = ultimate(ultilame) kiting tactics
Probably not what it was meant to be used for in the first place since it encourages running instead of increasing the "depth" of melee combat