I don't think low ability scores in and of themselves make a character more memorable, fun to roleplay, or any other nostalgic element of measure that that they often get, when referenced to characters with high scores (or more often when compared to characters that are tuned to a razors edge with point buy).
I think much of the feelings players have about these low scores is not the low score in and of itself, but rather its the memory of characters that started play with lemon stats, and the players went on and made lemonade out of them, and made a character that somehow managed to survive despite its flaws or even succeed. All the while the deficient stats are almost like big signs that read "PLEASE USE ME FOR ROLEPLAY". And IMO those low stats would be just as much a part of the character concept, as say, something like alignment.
So the short of it is IMO, its not the lows scores themselves that get that nostalgia rumbling. Its the possibility of getting low scores. And the challenge of making them work if you do get them. It sre is fun to kick ass and take names with a decked out toon, but its equally fun (and IMO sometimes moreso) to make a character do it with stats that are less than optimal.
Do I look for low stats to define my fun? Absolutely not; I would much rather roll an above average character. Have I had characters that have had a few low stats that were among my favorites? Sure have, and I enjoyed the challenge of getting them to succeed with those low stats.
Its realy in the hands of the fate. Some characters are not meant to live, regardless of stats. I play each toon like its my favorite. If it dies I make a new one. Whether or not they have high or low stats is not as important to me as the chance of having either.
But thats just my own view, YMMV.
love,
malkav