The whole thing feels a tad half-baked to put it bluntly.
Auto block is an inconvenience at best ESPECIALLY with gunblades since you cant use your combos since you're constantly blocking so you are forced to shoot the enemy with your rifle etc, even though you have a melee weapon specifically designed to be able to shoot people. Guardian derision also makes no sense now, if you want to use it effectively with someone like nyx you need to go into the mission with only a melee weapon as due to one of the more recent updates that is the only way to re-enable manual blocking. Quick melee being removed is also terrible, from polearms, sword and shield to sparring weapons, you cant just hit someone, no, you have to do a 5 second breakdance which makes you not want to use those weapon types at all if you're trying to be efficient.
on the upsides with specific weapons like katana's, single handed swords, greatswords... well swords in general, the new melee system is pretty fun, although i initially was very angry that E was the main melee key my concerns were soon gone after i discovered you have added in the control options to set melee to M1. HUGE thanks to whoever at de put that in, bless you. switching between gun and blade with swords is easy, quick and looks great. the new slam attack is also fantastic... its just a shame that this new system feels like it wasnt entirely thought out when it came to weapons that relied on their quick attacks to be useful, maybe adding a stance that gave weapons only the old quick attack would resolve those issues but maybe not : /
all in all, the rework is a solid 4/10,
has some awesome features, but has too many missing/ anaemic features to really be good.