Remember that mobility is only a +4 AC bonus against attacks of opportunity (i.e. when drinking a potion within range of an enemy). It doesn't give you a permanent +4 AC bonus.
Power attack will eventually be enabled all the time when your attack bonuses are high enough, so thats a cool feat.
Cleave is good since it's an extra attack everytime you mow someone down.
Improved critical is indeed cool. I'm currently using a keen rapier with improved critical and hit criticals on rolls of 13-20 which rocks. Even when I enable improved power attack there is still around a 1 in 3 chance that they will be hit regardles to the attack roll.
Weapon specialisation is well worth it. Since a human fighter will get around 19 feats by 20th level, taking 2 for weapon focus and weapon spec is a must. With a weapon such as a scythe, it's an additional 8 damage on a critical hit and my dual wielder using boots of speed and improved 2 weapon fighting attacks 7 times per round which means that 14 extra damage per round is great. (especially when hitting criticals between 13-20).
Other cool feats are knockdown, toughness and improved disarm.
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