As a person who used to listen to Vpop a lot, I feel many people are overrating the style more than it deserves. The truth is, the songs that are popular amongst foreigners are just made by a handful of artists. 90% of vietnamese music is sad-traditional ballads. Slapstick vietnamese humor music is the second most popular genre after ballads. There are some songs that stands out a bit and more friendly for foreigner ears, but they are few in between.
Vietnam is still a developing country. The country still relies on foreign aid to 50% of it's economy to sustain itself. 2/3 of the population still lives on the country side, and that's where the majority are poorest. We have to take that in consideration. It will take some years before they are close to other SEA nations like Indonesia, Thailand and even the Philippines.