Aside from fighters surge (which is sorta like that)
I do like them, but not the way they have been done.
I dont like them as some "once every X(days?)" resource. I like them as a number of uses every time you sit down. So for instance, per play session. Sounds weird right? I like players to burn them and allow them to excel with higher frequency.
Players are encouraged to burn them rather than holding on to them for the best time to use them (which sometimes never comes).
THEN, because they are common as chips, as a DM you are free to keep throwing them out for acts of good roleplaying, especially playing to characters that have well-meated out backstories with negatives. Then during play...
DM : The guard stops you
Player : I will try to talk my way past, but remember, I have aproblem with authority
DM : Oh yea, thats right, you are at a disadvantage...oh, and have an action point. (and no, you cant spend it to offset the disadvantage)
So action points are fluid. It also gives players incentive to comes up with flawed characters, because having a flaw isnt actually a negative. It means that your
a) Hatred of halflings
b) Bad body odor
c) feudal enemy
d) Criminal record
Encourage storyline without just being bummers.
Just a thought.