There are some truely pathetic BCs in .270 bullets, that's true. Awhile back I found a pile of bulk packed 130 power points or at least we think they were. Sometimes when the deal is good enough and large enough it doesn't matter.

. Shooting those on large steel targets at 500 on windy days was enough to make the hardest core .270 owner sit down and cry in the area usually kept watered with .308 tears. There's lots of ways to do things wrong. I would hope that those which seek to shoot long will go through the effort to shoot and learn. That might be hoping for too much though.
At closer range, perhaps more in line with what the typical box of the cheap stuff a year hunter is likely to shoot at it probably won't make much difference what he uses.