Aside from certain Traps that can be activated from the hand (Infinite Impermanence, the Dominus duo, and so on), Traps are generally regarded as "too slow" in the Yu-Gi-Oh
Keep your deck consistent: Maintain a consistent card ratio throughout your deck to increase the likelihood of drawing the cards you need when you need them
Not only are they vulnerable to removal, but spending an entire turn waiting to use an effect can be such a loss of tempo that it leads to losing the duel entirely
(Fusion/Ritual Monsters) Fusion monsters can only be played by fusing 2 or more monsters together with a Magic card that has the effect to do so (like polymerization)
There have been plenty of awesome cards, both with great names, art, and effects
They are not tournament-legal and are not recognised by collectors