Oblivion had perks too, they were just disguised as the next level of mastery bonuses.

No, not just a riposte, the ability to actually hit someone in the face with your shield if they're close enough. This was a very common usage in warfare in the pre-gun ages (especially with Spartans).

I've always thought that unless you're being attacked with a gigantic warhammer or axe, blocking should absorb 100% of the damage, thats how it is in the real world after all. If someone tries to slash you with a blade and it connects with a shield, the guy behind it will be fine, but if an enemy lifts a hammer above his head and smashes it down on you, a shield should do very little, it should be situation based.

Also, I'd like to see being able to charge with a shield, and not just when your a master at blocking, that makes no sense, anybody can shield smash someone, I could do it right now, but being skilled with it should increase the effect.