In 3e, drowning creatures had their HP set to 0 when they started to drown. So if they were at negative HP, you could "heal" them up to 0HP by drowning them. It was quite silly.
2e art was hit-or-miss. When it tried for realism or seriousness (particularly realism and seriousness), it usually missed pretty bad. But when it got Tony DiTerlizzi's storybook-esque sketches and watercolors, it knocked it out of the park. Toss-up between him and Erol Otus (B/X and some early-ish 1e era) as to who did the best D&D art, to me.
"Awesomeness inflation" is a good term for the issue I have with a lot of it. It tries too hard to be cool or badass or amazing or what-have-you and ends up feeling overblown.