Is my Yu-Gi-Oh deck good?

Not bad, better than some I've seen, yet it needs work and could be better. Reminds me of the old school zombie decks with a slightly new twist. Take a look into Plaguespreader Zombie if you can get one, he is a tuner that can be summoned so easily its laughable, this allows you to synchro summon practically once a turn. Another nice card is Mezuki a neat little zombie which, when in your grave, you can remove it to pick any other zombie in your grave and special summon it. This is nice because it doesn't take space in your hand and keeps your opponent guessing at when you'll use its deadly ability. The best zombie decks of these days were partially based off another deck called TeleDAD. By combining these synchro summons became fast and easy winning Shonen Jump Championship tournaments. Try to understand how those work and if you can base your deck like that you'll find the deck hard to stop!