The kit would be good if it was used on a normal server. On cubecraft shields are generally less effective than in vanilla minecraft (don't block all damage, don't prevent knockback). But more importantly, most of the time when you block an axe hit, the shield glitches making you unable to unblock or hit your opponent. Unless there is some strategy to avoid that glitch that I am unaware of, it is impossible to use the shield to your advantage. All it does is confuse players that don't know about the shield glitch and suddenly can't hit anymore.
Alternatively fix the shield glitch, maybe updating to the recent version of minecraft would help.
Alternatively fix the shield glitch, maybe updating to the recent version of minecraft would help.