I'll have to see the other perks in detail to judge for myself whether or not perks will be worth it, but at this point, to me, it's a definite yes.
Alright, so perks were implemented, that means more character customization, and increased potency with specialized skills. I am personally glad perks are in, it will widen the gap in power between those who aren't skilled and those that are. With Block as our example, let's go over what perks you can obtain when you level-up with Block at, hypothetically, the right level. These perks are from this video, from http://www.youtube.com/watch?v=ic6dKnv3WdU
- Shield Wall ---- More effective blocking. Bland, but useful.
- Deadly Bash ---- Bashing does more damage. Bland, but useful.
- Power Bash ---- Allows you to do a Power Bash. Gives your shield bash maneuvers more damage in the form of a power attack.
- Bash Disarm ---- Chance on shield bash to disarm. Typical, but awesome.
- Shield Charge ---- Possibly gives your bash maneuvers a lunge attack.
- Deflect Arrows ---- Worst case, reduces damage from arrows. Best case, negates damage from arrows. Shield up, of course.
- Quick Reflexes ---- Perhaps you bring up your shield more quickly? Would make getting those timed blocks easier.
- Riposte ---- Possibly a counter-attack of some sort after a parry with a weapon (or perhaps even a shield). Would explain why it's by itself.
- Elemental Protection ---- Your shield will reduce elemental damage, or perhaps it might be an all-around passive resistance to elemental attacks.
A few of these are speculation, but even so, the difference in power between one who specializes in the art of defense, and one who doesn't is massive. Players are rewarded with powerful abilities and passive bonuses, at this point I don't see why perks wouldn't be a good thing.
However, perks like the passive bonus "Shield Wall", while useful, are bland and boring. It feels too MMOish, and spreadsheety, which I thought BGS was trying to get away from in the first place.