Weevil Underwood is a recurring, low-power villain in the Yu-Gi-Oh! anime. He appears pretty consistently throughout the show to cause issues and generally be a problem, even if he doesn't ever really make that much of a mark. He tries his best, at least.
Overall, Weevil Underwood simply isn't that great of a duelist, and a lot of this comes down to how his deck is constructed. His insect-filled deck really just isn't all that powerful. Perhaps if he took another look at it and made a few changes to it, it could be much better.
His Insects Weren't All That Strong
Weevil's deck is filled with low-level insect monsters that aren't very powerful. While some of these monsters have effects that are sometimes worth it, overall his main set of monsters just aren't very powerful and don't really manage to stack up to other characters.
His main set of monsters isn't very good in the grand scheme of things, but his boss monsters might just be even worse.
Perfectly Ultimate Great Moth
Perfectly Ultimate Moth is an absolutely horrible monster. It has no redeeming qualities and should not be in anyone's deck. The monster can only be summoned once Cocoon of Evolution has been on the field for 5 turns - 5 turns!
That is absolutely wild. No monsters last that long, and after all of that work, all you get is a somewhat beefy beatstick with 3500 attack points. Not worth the investment.
Insect Queen
Insect Queen is also a very bad monster. It requires two tributes, has 2200 attack points, and requires an additional tribute if it wants to declare an attack. That's clearly an awful boss monster.
Sure, she automatically summons a token each turn if she destroys an opponent's monster, and gains 200 attack points for each insect on the field, but she still isn't worth it. Insect Queen is a bad card, though not as bad as Perfectly Ultimate Great Moth, at the very least.
His Combos Were So Easily Destroyed
Weevil has a very common strategy that he implements of turning his opponent's monsters into insects and then using Insect Barrier to stop them from attacking.
This seems like a great strategy, and it really stumps all of his opponents. However, this can very easily be destroyed. One Mystical Space Typhoon will turn that strategy on its head. Weirdly, no one in the anime figured that out.
Cocoon Of Evolution
This has already been mentioned once, but one card that Weevil has in his deck is Cocoon of Evolution, a card that has to stay on the field for five turns in order to bring out Perfectly Ultimate Great Moth.
This card only has 2000 defense points and 0 attack points, so keeping it on the field that long is not going to be easy. And, as mentioned, it isn't going to be worth it either.
Has To Cheat To Win
Whether he's stealing the Duelist Kingdom rulebook to learn about field power bonuses or sneaking cards into Joey's deck before matches, Weevil has to cheat when he duels. And he still loses consistently.
If Weevil has to cheat when he duels, it must come down to the fact that he doesn't trust his own deck to carry him to a win. It never does, but still.
Very Few Spell And Traps
Besides previously mentioned cards like Insect Barrier, Weevil doesn't have that many spell or trap cards in his deck. The majority of cards he packs are monsters, which is fine, but it isn't likely to take him to a win.
A more balanced deck would serve Weevil well. Spell and traps are going to give his deck a lot more utility. In addition, one kind of card, in particular, is really going to help his deck a lot. Cards that can remove the opponent's cards from the field.
No Removal
Throwing in a simple Mystical Space Typhoon or two would really elevate Weevil's deck. He has absolutely no way to prevent his opponent from playing spell and trap cards that will derail his strategy.
As mentioned, his entire strategy can get stomped on with a single spell card, so Mystical Space Typhoon could really help him out in that regard.
Poison Butterfly Strategy
Yugi, in this case, to make him lose 500 life points each turn. This isn't that many life points in the grand scheme of things.
It would take a minimum of 8 turns to take out an opponent this way. Since Poison Butterfly has some nice stats, as well, it isn't going to be defeated easily if Weevil had needed to reverse course.
Predictable
Overall, Weevil's strategy is just very predictable. He uses the exact same cards from season to season. Weevil uses the same strategies and also doesn't have any notable combos except for his Insect Barrier one, which, as mentioned, is very easy to dismantle.
Weevil simply does not have a very good deck. He didn't when he was introduced in season one, and it continued to be bad until the series wrapped up in season five. There's a reason he had almost zero on-screen wins.
