the Jester said:
The one thing that makes dual strike tough is the need for a partner with it, but if you plan well with another character it can be very handy. To those who say a +2 attack bonus is too light for a feat- show me another feat, even one usable in limited circumstances, that gives you a +2 attack bonus and I"m taking it for my fighters!
In general +2 is not too light a bonus for a feat. +2 is too light for a
highly specialized feat. Any feat that can only be used in a very specific tactical situation and has a 3 feat prereq (combat reflexes, combat reflexes on your ally, dual strike on your ally) is highly specialized.
Other feats that gives a +2 or better effective bonus? Armor Proficiency, Weapon proficiency, Weapon Finesse, Point Blank Shot (+1 hit & +1 damage is close enough), Expertise, Mounted Archery, Multiattack, TWF feats, Precise Shot, Blind Fight.
All of those do not apply to a fighter, but it is still quite a long list of feats your fighter will take before Dual Strike.
I will also mention Weapon Focus because a +1 (almost) all the time is better than a +2 some of the time.
I would cut this feat some slack if it worked against targets that could not be flanked. That would make it attractive. But I assume it doesn't.