Here are my opinions after some rough playtesting....
Arcane Strike: This feat is only good for bards and while it is okay at low levels (1-3), it is not good enough once PCs start getting access to magic weapons (4+). The overcome damage reduction and +1 bonus to damage are just too paltry.
Backswing: This is decent at high levels. Primary fighters will almost always hit with thier first attack in a full attack so getting another attack at one's highest attack bonus for a successful hit is great. The hit to damage is not that bothersome either. With haste, a two-handed fighter can muster six attacks per round - useful but it doesn't add anything NEW to the warrior toolkit at high levels.
Cleave: A good low-level feat which (for the most part) covers the old version's capabilities and adds something new.
Dazzling Display: This is more like it! It gives warriors some form of short-term group debuff (through inflicting the shaken status) and could be very useful into high levels because if multiple warriors do it at the same time, they have a good chance of inflicting frightened and panicked status on a good portion of the opposition. I love it!
Devastating Blow: This is a good upgrade to the fighter's standard action attack and affords the fighter some mobility at high level.
Dodge: Good low-level. A bit better than before, but since it's a prerequisite to better feats so it doesn't have to be stronger.
Gorgon's Fist: Good control move. The staggered condition it inflicts makes the feat very useful against thwarting melee-based opponents and pinning artillery to a particular spot. The duration and exemptions to the staggered condition infliction also keeps the feat from being cheesy. It's also only a standard action, making it great through middle levels. It can be very useful into high levels but iterative attacks might take precedence.
Great Cleave: Like Cleave except it allows you to hit all adjacent opponents at most once as long as you can keep hitting. It's a great mook sweeper but I cannot say much else. Whirlwind Attack is better at being a straightforward AoE attack. Then again, Great Cleave is only a standard action so you can move before or after the feat.
Lightning Stance: I don't like this feat. Needing to move or withdraw makes it good only for escaping. It would be MUCH better if you could use either fighting defensively or total defense and "blink tank" with it.
Manyshot: I like the old Manyshot more since it allowed mobility. However, this is simpler and more straightforward. An Str 16 archer with an composite bow can inflict an additional 7 points with his full attack on average making this good at mid levels. At high levels, the bonus damage just gets better however damage reduction and lack of additional precision-based damage reduces the usefulness.
Overhand Chop: Good low-level, poor mid-level and beyond.
Scorpion Style: Good control against mobile foes.
Shield Slam: Good control manuever for mid level characters, a useful addition to a sword and board fighter's toolkit. Against the numerous giant-sized opponents that high level characters face, its utility reduces at high levels.
Stunned Defense: Great in conjunction with Intimidate (Dazzling Display) and Deadly Stroke.
Vital Strike and Improved Vital Strike: These feats don't seem all too great. Since you're only getting bonus damage dice with the trade-in and it doesn't multiply, your base average damage only increases slightly and the increase doesn't make up for the loss of iterative attacks. Only useful if you're facing a lot of opponents whose AC you cannot possibly hit with your third or fourth iterative attacks. Still, this is a high level feat and it should be better.
Wind Stance: It's okay, not great.
Overall Opinion: I like what I am seeing in regards to the movement control abilities (Scorpion Style, Gorgon's Fist, Shield Slam). I also like Dazzling Display and also Stunned Defense and Deadly Stroke since they build on that. Please continue adding more of these battlefield control abilities for warriors and monks.
However, I would like to see Wind Stance and Lighting Stance improved - make them more flexible defensive options. I would also like to see Arcane Strike improved or more feats built atop of Arcane Strike so warrior-mages have some toys to play with at mid to high levels. Also, Vital Strike and Improved Vital Strike need much more oomph being high level feats.
