I wouldn't say love, but I have many fond memories of 2nd ed as it was that edition that got me into the game. A lot of things had too many intricate rules, which was better suited for an RPG game though.
Good things:
- To hit and armour modifiers, much more realistic while not cumbersome.
- Psychic powers had character/flavor.
- Bikes and cavalry was separate entities from their riders.
- Short range and Long range for weapons, often -1 to hit at long range rather than less shots.
Bad things:
- pop-up attacks, essentially JSJ.
- Overwatch, as it often resulted in a stalemate.
- Hundreds of different grenades and missiles for every purpose you can think off, might even have had grenades for baking bread.
- Psychic cards, most giving 1 warp charge, but some gave several, and some were duds if I remember correctly some were even perils, which you could force your opponent to suffer when the opponent was trying to cast a spell. Not much worse off than currently though.
Once 3rd edition hit though, I quit. Most units point cost were cut in half, and the standard army size was doubled, along with the codex being unplayable.
I got back though just couple of months before the 4th ed eldar codex dropped, and have kept up with the game after that.
Edit: I think 4th ed has been the most balanced one so far.