Well this movie didn't have the budget as many, though it was a huge film especially for South Korea, but expensive CGI is usually what you see in American films only (now we're starting to see some exceptions, and even The Host a few years later proved that a Korean flick could have great CGI, but then, that creature was the main effect they had to work on.)
The planes look fake but the shots aren't bad, the part where it looks like a "helicopter" (i.e. the plane view) I think was stylistically supposed to move that way, it wasn't literally supposed to be a POV. A lot of the CGI violence is subtle and better, and actually it's little details that are CGI-d. A lot of it is practical effects, or dummies put in place of actors, cut together by one frame before an explosion to give the appearance that a human actor just got blown to pieces. A lot of practical on-set stuff, that's what this movie was about as far as recreating the battles. CGI just helped aide it, like with the tracers, which is why a big obvious effect like the planes stands out.
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