Well, well...seems like 3 of the 4 classes i play are mentioned on this thread
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I'll start with the one closest to my heart...I'll agree with the posters above that a mage's toolkit is limited (and by that i assume you mean no CC). But I think people are kidding themselves when they say a mage is underpowered. I have solo'd past 55 without having to chain summon pets. Fights hardly take any effort. I melt blue cons when facing them 1v1 faster than almost any class besides a wizard dumping all of his mana, and for me it takes - if sticking with one pet - just a 1/4 of my mana bar at most, while with chain summoning i have 90% of my mana remaining. Not sure how that's underpowered.
I get the lack of CC sucks but honestly, there are plenty of places to kill that require no CC. Even past 55. And also, anyone who's actually played a mage for a long time and knows about the class will be able to handle 2 mobs, sometimes 3 if they are weaker, using the earth pet and its root. The pet should almost never have to face more than 1 mob at a time if you do the root dance right.
As for druid, I do feel the class is offensively weak, but that's the tradeoff - it's such a versatile class essentially containing three different gameplay styles (root rotting like a shammy/necro, charm fighting like an enchanter, or quadding like a wizard) but obviously can't be the best at any of them. Good for people who get bored playing in a certain style for too long.
I'm not going to defend paladin, because quite frankly it has been EQ's best kept secret (if you like solo dungeon crawling).