I think Tweet is overreacting. I've used, and DM'd, 3.5 PA in many games, and in no case did I find it broken, nor did it slow the game down any more than any other damage mechanic in the game. I encouraged players to pre-calculate some set PA levels and write them on their sheet, and then it works like any other attack. It did encourage more two-handed weapons in play, but that was a nice change from what would have otherwise been a bunch of sword-and-shields.
Can it be used for some sort of spreadsheet-based horror? Sure, and if some players find it fun to do that, more power to them. I suspect that's more the exception than the rule. I've personally seen more all-power-attack-all-the-time. And in my opinion, an game element that allows for multiple styles of play is a good thing for players.
For the DM, it wasn't much more complicated, and it made a range of monsters much more impressive.
I'm starting to see too much from the 4E team that seems like they are changing what isn't broken just for the sake of change.