Quick note, I don't play the modern game.>>79797077
The likes of Heavy Storm, Raigeki, and so on, can be considered controversial cards, but they are justified in gameplay by the limitations they impose upon the opposing player. A player might not want to commit too much to the field at a given moment, unless either the significant meta field clearance cards have been used up, or they can justify their actions with a card that protects them against said card.
Or, in other words, playing Heavy Storm in a format in which it is legal effectively grants the opponent permission to set as many cards as they feel like doing, because they will no longer be punished for it. Such interactions are considered invaluable and a core part of YGO in the minds of many old school players.
Pot of Greed has no such interactivity. You draw it, you play it, you are instantly advantaged for doing so in every deck in the game.>>79798731
Within this game, 3 card OTKs are considered about as optimal as you get for a dedicated deck - that deck being, you acquire the three card combo you want, and you win with it immediately. Three Magical Explosion or something, with the rest of the deck being made up of draw spells, in order to set up for an FTK. These decks are widely considered to be scummy and skill-less (although they are not actually the latter, merely non-interactive and unpleasant to face), but they are generally not reliable enough to be considered worth using in a serious tournament you are legitimately trying to win.
Pot of Greed makes these decks absurdly more consistent. There's something of an art to the practice of being able to manage your hand with such a deck without it clogging with the wrong side of a draw engine (drawing three copies of Trade-In and no Level 8s for instance), and Pot of Greed allows you to effectively gain an extra +1 resource for it throughout your game of solitaire.
The card is an FTK enabler.