We have a great group, and last night had a great session finally ending The Witch's Song, but some things kinda started to get my goat. We have several players (I was GMing but we switch off) that have Riposte or Counter Blow (a couple have both) and it makes for some weird situations.
The worst offender are those with both which has resulted in (several times) them ending up with 3 attack actions in a single turn. This generally only occurs when fighting an opponent who is tough enough to withstand or turn away multiple attacks, but that is not too uncommon for a party of rank 3 characters. They have the appropriate improved defensive reactions, so they will use Improved Block and Improved Parry against the opponent's attack which makes defending against it easier, and when that single attack misses they are free to (RAW as I understand it) use Riposte and Counter Blow immediately in addition to their attack action they will or may have already used during their initiative order. It starts to become nutty, and I am not sure if I should suggest a house rule that I have a feeling would be resisted.
The other thing is more minor, and probably is a result of a lack of imagination on my part in envisioning the abstract system. The situation was the dwarven damage master decided to ignore the Corsair he was in an engagement with and instead to rush past him to stop a ballista from firing burning pitch all over the characters. We use a very limited version of Attacks of Opportunity house rule, and since the confines were narrow I ruled that the Corsair would get one free melee attack action as a result. The player was fine with it and felt it was an acceptable risk. The part that put me off is that the player, as he has a right to do, used improved block and the attack missed, this gave the player a chance to freely use Counter Blow which tore the Corsair to pieces. The player then just whizzed passed, took a bunch of fatigue, and proceeded to use Reckless Cleave on the NPC about to fire the ballista. The part that is hard for me to imagine, and which we all laughed about like madmen (it was 1:30 am and we had been playing since 5 pm), is that if the Corsair had just decided not to take the AoO he would have been fine and lived, but because he attacked he was able to be attacked for free as well and was killed.
Now I know that this last one is in part due to our house rule, but it would have been the same situation if both the PC and the NPC had the same initiative and the PC had ignored the attacker in the same way.