What era are you talking about man? Because it sure as shit wasn't anything up until PoP (And even in PoP). EQ was balanced like dog shit, the only reason it didn't matter is because what was important from each person was raid attendance and dedication, because there were no raid caps. In most cases, there was absolutely a "best choice" in terms of recruitment, if you already had a few Wizards for example, there were very few cases where another one was better than a Monk. Monks did more DPS thanks to their sustain, more durability, could pull and could simply tank if needed, not to mention self heal. There simply was no comparison, at all. But the point wasn't to get "the best for that slot"--the point was to get someone who could do the job and show up all the time, and was dedicated enough to grind their character (And in a group setting, it was more about fitting into the group). Having a Wizard might not have been as ideal as a Monk--as DPS, for example, but it was better than having nothing, and since you didn't really have a cap, meeting a great player meant you snagged him.
Seriously though, you actually thought Wizards did more damage than Rogues? Come on buddy, it's time to let your visions of grandeur in the past go

. I'm sorry, but every game, I think literally all of them, has improved on EQ's balance. The only reason they feel more out of balance is because they highlight their imbalances by putting things like low population based raid caps in. (Even when EQ did have raid caps, they were fairly generous--except for some absolute top end guilds, you were usually concerned with filling the raid over getting what you wanted in terms of classes.)