I briefly played in 2.0, started probably a month before HW came out (and left a few months before SB release only to return in ShB) and for me I'd say I certainly enjoyed the class system more back then - lot more identity to the jobs, familiar spells (Stoneskin, I was a bit bitter when SE took that away from us), and to be fair, I did like the inter-class requirements for some of the advanced jobs - just made sense lore-wise that to be a Paladin a Gladiator would need to learn White Magic but I can understand how some found it frustrating (for me it was a bit reminisce of FFXI sub-job system so I didn't mind it at all, plus I do like trying out all classes in a game).