As KaizaUrai already stated, I wouldn't recommend giving the AI any other decks besides the AI decks, that come with the program, unless they are very linear and don't have cards the AI can mess up. It will activate everything in random order, search random cards without any kind of concept and it will target random cards with its effects, usually destroying its own cards in the process or buffing yours for no reason.
The supported AI decks do vary in strength a lot as well, though, decks like the Yugi or Kaiba character decks are very weak, other decks like Fire Fists or Heraldic Beast are moderately strong and can pose a challenge at times. And then there are the more recent archetypes like Nekroz and the new Mega Monarchs, which, even though the AI definitely does not play them perfectly, can absolutely crush you, just because the base archetype is so powerful.
If you don't like to play against a certain type of deck, you can always just remove it from the random deck selection, by renaming, deleting or moving the deck file to a different folder. However, keep in mind, many decks can do very powerful and seemingly unfair plays. If you start removing AI decks, just because they crushed you once or twice, you might run out of opponents at some point 🙂