In general, I think the relative value of all the skills needs to be reassessed. So many people just max Power Strike and Athletics, neglecting all other skills. So you end up with lvl 34+ builds like 30/18, which is totally ridiculous.
-Ironflesh is totally useless for an archer or light armor player, but a huge boon to the Strength-heavy builds in plate. There has to be a way to equalize its effectiveness for everyone (maybe switch it from HP bonus to post-armor-soak mitigation bonus?)
-Weapon master does woefully little compared with spending those points on more str or agi. Maxing weapon master should make someone a "master of their weapon", not allow them to swing a whole 2% faster and do 4% more damage. It should allow cool duelist features that go beyond damage and speed.
-Shield skill doesn't affect much (only durability, and slight improvements to speed and ranged coverage). Why can't it affect crushthrough resistance, block stun resistance, shield weight encumbrance, bolt penetration, shield bash cooldown (oh, add shield bash please), etc etc
-Athletics should reduce fall damage (this matters to me, since I get at least one fall death on every siege round), and maybe reduce the wpf penalty from armor
-Riding doesn't do much beyond the requirement for riding a particular horse. How about riding above the requirement allows moving dismounts, higher jumps, faster mounting/dismounting, faster rear recovery, etc?
Basically, buff the skills so their bonuses are on par with the huge passive bonuses from Strength.