Ejo Thomas summarized it well, though. Basically, they slightly buffed casters thanks to every single race getting a mental +2 (aside from humans and half-elves, there are a grand total of THREE races in all of paizo's books up to now that boost strength, just to compare, and one of them is orc, which gets a net -2 when most races have a net +2 to stats...), gobs of new powerful class features, new powerful feats(Dazing Spell, Spell Perfection, Bouncing Spell, Selective Spell, Divine Interference, to name a few of them), and even new broken items (there's a ring in the just came out Ultimate Equipment book that's basically free 3E Persistent Spell on any one spell w/ less limits than the 3E feat had).
At the same time, they beat the ever loving shit out of anything good noncasters had, practically. Tumble DCs are impossible (but there's spells to move w/o provoking); pounce is now a ~level 10+ benefit for martials (but a caster class can get it at 1); combat maneuvers were across the board nerfed to shit, some especially hard (grapple is now a standard, not an attack replacer, is MUCH less penalizing than it used to be, and you have to roll to maintain it each round just to avoid letting go, aside from the foe's attempts to get out, for example), and the Improved feats were split up so they now cost more feats and take longer to obtain; flasks and any other odd items like that can no longer be quickdrawn, only weapons (splash weapons apparently are not weapons) and you cannot sneak attack with splash weapons...paizo had a massive hate-on for flask rogues and ranged rogues in general...actually, rogues in general; spiked chain was nerfed so hard that it's possibly inferior to the freaking longspear now!
They even nerfed STAND STILL! It's completely worthless now. The equivalent effect of 3E stand still was eventually ported over...as a level 11 Fighter-only feat.
I...don't feel like listing more. Again, PF made casters stronger and non-casters weaker. Anyone saying "it's about the same" or "it fixed a little but not nearly enough" is at best telling a half-truth, but in many cases, is lying through their teeth.
