As brilliant as Vanilla WoW was, it had massive issues.
The best thing about the game at that time was that it was fresh, fun and it was most peoples first look at an MMO.
Above all else though, it was the fact you could log on at most times of the day and there would be 3-4 (minimum) other people from VT online who you could group up with. We had some great times.
I've re-subbed / quit numerous times now but the first few times I quit it was mostly because I thought it had lost the allure those first 6 months / year had. Eventually though, I came to realise that time will NEVER come back (in this or in other MMO's) and you either accept the game for what it is today or you quit for good. I've found since accepting the Vanilla days are long gone, that my enjoyment of the game has increased.