So my overall experiences
- I kind-of-sort-of played BECMI in that we rolled dice and attempted to do things based on what we thought the booklet said but 100% we did not get it.
- I played in several 1e games in the very early 90s. It was fun but also a lot of "really? This is d20 and that is %?"
- 2e I played in several dozen short lived games, but I DMed a lot, with my main experience of running 2e from 3rd-23rdish level (class-based xp charts!) for 9-15 players (meaning I didn't play if there weren't at least 9 players present).
- 3e I ran a 1st-22nd (23rd?) Level game for 5-8 players and played a couple short lived games
- 4e - skipped. Played it once, saw what they did, decided it wasn't for me.
- 5e -was a player in a 1st-20th game, but I didn't show up until 7th level. Have been in an Eberron alt game
So my take on 2e : It was much better organized than 1e, more balanced but also a bit more sanitized. It was, by comparison to many other products, well organized and well produced. It was also expanded to a fare thee well, with an insane number of supplements. Class books, race books, setting books, meta-rules, and so many creatures. I mean, I took all the entries for the Monstrous Compendium, put them in a spreadsheet, and made d1000 random encounter tables by geography. (Such a nerd...) but my point is you needed a d1000 because there were hundreds of creatures per environment.
I have fond memories of my campaign, but not the rules. However I don't have memories of hating the rules, either.
2e was kind of mooted by other games. Shadowrun, Mage/WW, Cyberpunk/gen. Will say MtA 1e was a mess and I did hate parts of that system. Mostly non-fantasy. Played Runequest, was never really invested in it. Earthdawn was the exception. It did D&D better than 2e because it leaned into the weird tropes and made them in-game canon. Layers of setting, rules and math. It is delicious.
3e I would play or run again tomorrow. 5e as well, though my personal preferences are towards 3e style crunch. 2e....only if someone really wanted to experience it. Which is probably as telling a commentary as anything else I could say.