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But have you been to Vietnam and had the food there?

OP starts off by stating they're Vietnamese. So I would assume yes
Vietnamese food is amazing but the whole idea of ranking cuisines from best to worst is a bit silly, there's no such thing as the top 3 best cuisines. >

True, it's only a bit of fun. And you can only really go by personal experience.
But in my travels I'd have to agree that Vietnam is up there. Thailand too although that got a bit samey somehow. >

This is a cool take.
But have you been to Vietnam and had the food there? I will absolutely eat the standard American-Vietnamese foods. But you will lose many people at Bun Bo Hue. And I am sure with authentic Vietnamese, you will lose a lot more (but probably less than other SE-Asian countries).
Vietnamese food doesn't have good desserts imo. Their curries aren't as good as other nations either. I guess they have a lot of borrowed dishes like curry, short ribs, egg rolls, to fill the void but I've never had success with them. I guess I haven't ventured into many of the other soup-based dishes, but that is because I tend to prefer actual ramen over mi dishes. And I think Korea has a broader range of soup dishes (although most of 'red base'). 
What are your other top 3?
I am Korean. I like Korean food, but I absolutely think it does not have enough variety (on American menus or otherwise). But in my experience, it has slightly more options than American-Vietnamese places. My mother disagrees and says American food has no variety.