We're going to look at 2e for balance mechanics? Really? Good grief, balance was so bad in 2e that it was ridiculous. The difference between two PC's just because of character generation could be night and day. A 1st level fighter in 2e, straight out of the PHB, could kill up to six HD creatures in a single round (not the first round, true, just the second). 18/percentile strength and weapon specs meant you had a minimum +5 to damage and double attacks every other round.
People tend to forget that 3e beefed up the monsters a whole lot. Most creatures got two or three times more HP going from 2e to 3e and doubled their damage as well.
3e, for all its higher level balance issues, is head and shoulders better balanced as a system than 2e was. That was the whole point.
Let's not forget, when talking about 3e balance problems, we're generally talking 9th level plus. By 9th level in 2e, your character was a GOD.