Yeah, so... Pathfinder Beta. Caveat: I'm aware that BETA means it's not finished. Further, I love Paizo's adventures and I'm rooting for them to succeed with PF.
I really wanted to like this product (and I am a Charter Subscriber, owning every Pathfinder book & adventure published to date), but as many others have said it doesn't address the issues I have with 3.X, while adding even more power creep and unnecessary bookkeeping.
Rage and Ki points: thumbs down, we need LESS bookkeeping, not more.
Failure to fix multiclassing progression for casters. Failure to address wizard, cleric and druid superiority vs. other base classes.
Failure to address skill scaling, as others have detailed.
Changes to working subsystems (cleave, etc.) for the sake of change, invalidating existing 3.5 material and requiring new rote memorization of rules. Again, this slows down play.
I truly believe the best option for Paizo is to give up on publishing its own ruleset for 3.X and just concentrate on writing their superior-quality adventure paths and setting books. Golarion is a fabulously detailed world already, and I appreciate its commitment to multiethnic and multicultural social structures. IMO no one in the industry is even close to Paizo when it comes to art direction, production values and pure flavor/ambiance.
However much I love Golarion and the GameMastery adventures, I will never convert my own 3.X games to Pathfinder. I will loyally purchase and utilize the setting books, adventures, Harrow Deck-type products, etc. but I have absolutely no use for a "3.75" iteration of D&D. I am a 4E supporter (after initially being a severe skeptic) and a 3.5 legacy supporter as well. Both games have a place at my table and on my shelf. Pathfinder The Game (as opposed to Pathfinder The Setting) has no place there, as I do not wish to re-learn a clunky and incorrectly fixed version of 3.5.
So I will run all the Pathfinder stuff in my own lightly houseruled 3.5, and in all likelihood will not get involved in the Pathfinder Society... which is rather a shame in many respects. Paizo makes awesome, fantastic products but after reading and testing the alpha, and reading through the beta, I am not seeing a cleaner, faster, more balanced game than 3.5.