Grog said:
Well, isn't that the whole point of PrCs? To be better than core classes?
No, the PrCs should be more SPECIALIZED than core classes. By sacrificing abilities you deem unimportant, you gain unique abilities that you want. The power level should stay the same, or else everyone would have to take a PrC just to stay even. In a perfect world, your PrC would be a natural fit for the abilities you were already focusing on. The prerequisites would be the skills and Feats you already were developing, the abilities would enhance the things you already did. Of course, that's not how it turns out in a lot of cases, but that's the theory.
For example, you're a Rogue. You get lots of skills, sneak attack, and a few miscellaneous high-level abilities. But, you want to be more of the agile, evasive type. You become a Shadowdancer, trading Sneak Attack and the extra skill points for some useful magical abilities. It's balanced, since you gave up some useful abilities to get other ones.
Think of the 7 Specialist Wizards as pseudoPrCs. To get in, you have to sacrifice one or two entire spell schools, but in exchange you get extra spells per day of your chosen school. It's still relatively balanced (I know a few people who still play generalist Wizards), just different. Think of the Paladin as a Fighter/Cleric PrC that gives you a code of conduct, but in exchange gives you a mount, better saves, and +1 casting every other level.
Anyway, with this philosophy, you can see why classes that give full spellcasting at every level are bad. You sacrifice nothing, but you gain substantial power. You haven't actually specialized in anything.
For example, I could be an Evoker, but I scribe a few low-end divinations and spend some skill points on Knowledge skills I don't use much. At the cost of ONE useless Feat, I become a Loremaster, and keep my full spell progression and get some miscellaneous abilities. But it doesn't impede my Evocation spellcasting, so I gain in power with no real drawback.
Marshall: that was what I said, actually, so we agree. Although, I don't think EVERY caster PrC should give +1 caster level at every level.