Well, I think one should never make something blinking if it's not supposed to flicker.
For example, if your hero is invincible after getting hit, make him flicker. If you want to add a cool effect to animated fire, make it flicker. But, by all means, if you want something to be transparent or some way to average color, DO NOT MAKE THEM FLICKER.
This is the global consensus, no matter if it's still screens or wathever. I mentionned Batman's intro, but there is also the water area in Castlevania 3, which are the same problem.
Konami throught "well we'll make Trevor's leg's flickering so that the color will average, and they'll look like they're in water". NO THEY DON'T they look like crappy filtering legs (emulator / old display) or like horizontal vermicelli (modern display with interlacing).
Also I tested them on my new monitor, and apparently it switches the even/odd interlacing every half second or so for some reason, so it looks horrible, it flickers at about 1 Hz, which is even worse.
The pics that doesn use flickering, such as Angel 2, Joku, Teen and Teen2 looks really amazing.
The individual frames in most flickering images looks really good by themselves, but you have to pause emulation to really admire the pic.
When the flickering is very slight, such as in "retarded", it might actually look decent. The worst is as seen in "cry", there is a lot of flickering full areas which looks just horrible.
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60's where?
Well some of those pics are just 60's old-fashioned (or it might be 70's, to me it's the same).