Gethsemani said:
1. Mages are Gods. There's very little reason not to roll double mages and then getting two more mages for your party. Mages can use all the battlefield-altering and status inducing effects and deliver both the spikiest and most consistent damage in the game. Your warrior might be useful, but not as useful as a mage that can summon a warrior (of preferred element) and then go to town with status effects, damage, debuffs, buffs and what not.
Not entirely true - mages are pretty useful in the beginning, as they have a lot of versatility, but they are caught up by the other classes. Warriors in particular sort of suck in the beginning purely because they don't have the AP, not because they can't participate anyway, however, they do swing for a lot of damage later on, moreover, they soak the hits intended for mages. The summons don't really surpass a warrior in terms of usefulness - the only thing summons are better at than warriors is expendability. The warrior's abilities also help them deal with the battlefield. The rogue is probably one of the weakest in the game, but only because they need some setup - level up stealth and they do damage on par with warriors. They also have more utility skills to boot, which can be invaluable depending on situation. The rangers are actually of of the most powerful classes in the game with their special arrows - they are pretty much mages, but they have no cooldowns on their spells.
Back on release the mages could become stupidly powerful due to some exploits in the game, however, I've heard that's been fixed. It only worked with a limited amount of mages anyway, as it was exploiting the skill book trick[footnote]there is a merchant who sells a boot that raises attributes and that gives you skill points and it was supposed to have a limited supply of them. However, it actually restocked every time you levelled up, so you could get more of them than you were supposed to.[/footnote], and even
then the amount of extra stats was limited. You needed, I believe, 27 Intelligence to hit the sweet spot but whatever the actual number was, it was rather hard to get two mages up to that amount, let alone more.