What were your favorite and least favorit graphical effects in the early 8-bit machines and arcades?
I personally liked highly saturated vector lines. There was an air of futurism about them. Think most any color vector game. Perhaps a couple of monochromatic games also fit the bill.
I also like the simulated silver shimmering of color-cycling text through part of the palette. This is prominent in Liberator, the word "Liberator" in the intro text, the explosions, and parts of the ship. It's also on the startup page of Atari 400/800 Defender.
And then there's anything with a lot of flying particles and debris when something explodes. Love it!
I tended to dislike things done with text-characters and tiles. Or anything with tiled graphics. Don't exactly "hate" it, just tended to not be interested because it felt cheap. I didn't like a lot of 16-bit sprites either, they always felt like paper cutouts simply being positioned around the game screen. Artificial in a way as opposed to something plotted each time bit by bit.