DoT weapons in PS2?

[Kriegson]

I read somewhere that some VS weapons may cause damage over time, and with the inclusion of the flamethrower, it seems logical that the fuel would stick to someone and burn for a bit rather than it simply being a damage stream with a fire effect for display.
That being said, how do you feel about weapons that do damage over time? Miniature flamethrowers that can be mounted under full length weapons (rifles mostly I would imagine) and incendiary rounds could provide an interesting dynamic.

Though in my experience, no one likes a slow death that they can't do anything to prevent. Even if they would have been killed outright by a normal round, it's still not enjoyable to watch your HP tick away helplessly.