I ran a 1st level Pathfinder playtest (The Rose Street Revenge) at Gen Con. My tables seemed very happy with it.
Things I liked:
- Having less attacks of opportunity actually frees up combat, and makes it faster. It gives more people more things to do. I like this.
- Having 3 potential attacks a round is HUGE. Crit failure on a check that doesn't have a listed crit failure effect is just a failure. So this makes the -10 for the 3rd attack a "Well, I have the remaining action so why not." which translated into it being ill advised to rush into a group of mooks. They almost always took down the big fighters.
- Instant death is harder to achieve. For instant death you have to take double your max hit points in one single hit. Otherwise you're just at 0 with various dying conditions.