I'll first go over how each preconstructed deck plays, why you should buy it, and the various directions that you can upgrade the deck and make it your own
It also has the classic problem of blue removal not being great, as Witness Protection is clearly outclassed by white and black options
Also, with so much of the deck focused on and rewarding your characters in battle, it can potentially become easy to get lost in the fight and fall behind when trying to gain lore
I almost shouldnt need to explain why thats absurdly powerful, but let me give you an example
Quaquaval ex Gold water starter and trio completion card
Jaden then activates Yugi's "De-Fusion", sending "Elemental HERO Neos Knight" back to the Extra Deck and Summoning his "Elemental HERO Neos" and Yusei's "Junk Gardna"