I mean what's going, man - Itachi's Susano'o was invincible, it could reflect any and all attacks and could destroy any opponent with one hit (of the sword). Sasuke's Susano'o, however, is weak. That's it - it's weak. Some random guy with enough strength, and by that I mean pure, straight-forward, brute force, can break it, it can be outmaneuvered and its attacks are useless against good shinobi. The items that Orochimaru was talking about, that Itachi had - the Mirror and the Blade, are they even items? Maybe they are some spiritual objects, but if so - wouldn't Itachi consider transferring them to Sasuke as well?
Let me know what you think in the comments.
Let me know what you think in the comments.