@Leucrotta I think the things that made D&D "not cool" at that time was a combination of the sentiments that it was a "brand-name" RPG everyone thought about first when thinking RPG's, and certain kinds of people considered especially "uncool" played D&D. You wanted to be that edgy/cool nerd you played something deviant like Shadowrun, Vampire or Werewolf. They didn't require specialty dice, didn't have a mountain of specialist sourcebooks, and seemeded more narrative-friendly.
@Yolfen You got me thinking about a rules/perception thing with dice though - not type, but number. I think in contrast to AD&D, rolling multiple dice is way more emotionally satisfying - like even if it actually didn't translate to a higher chance of success, it LOOKED more like you could succeed and you had a really physical handle on how badass your character was.
@Leucrotta That is one of the reasons I enjoyed playing the campaigns for the original Descent: Journeys in the Dark board game. Over time you were adding more and upgraded dice to the roll, so you had a tangible measure of your character progress. You could still roll poorly, but when you rolled well it felt so good. :3