For Me Critical Shot 3/3 is not worth it. If you go the creafting way, then the difference in output damage would be 24pts MAX. I would just take Critical 1/3 as a prerequisite for the rest of the perks.
I don't consider it Critical, unless you're playing a pure archer, then ever little bit helps. Same with Ranger, if you're working a whole bunch of skills (Like a Nightblade) then that's 5 points you can do without. Moving with a bow drawn isn't needed for sneak shots, but running around the battlefield while the tanks trying to chase you down.
Also Bull-eyes is not worth it either. Paralyze is nice, mostly for 10s. But paralyzed target lay flat on the ground, making it MUCH HARDER to hit him with a bow. Or you will have to run to him to finish him off with your dagger.
Not to mention the fact that you might dismiss a Paralyzed target for a dead one, or you killed him in one shot, so it wouldn't have triggered in the first place. I see this is an 81 build, which means training up 2 handed, Heavy Armor, Block, and all the other skills to maximize the perks points. If you're more efficient about the ones you pick, you shouldn't have to moonlight as a tank warrior, or bookshelf train to fill out all of these trees. For Archery, you don't need more than Overdraw (5)-Quick Shot for this build.
Sneak:
I prefer to use Invisibility and Muffle spells over the perks Muffled Movement, Silent Roll, Silence. But again, my character doesn't dual wield, So I can have a spell in my off-hand.
Stealth (1) should be all you need, with Illusion as a backup. Also, you might want to add Critical Charge to 1 hand, since you can combo it with Silent Roll for a double damage critical. (in addition to all the backstab mutltipliers!) This means that one guy, standing around the fire with his buds (with Aegis Bane on his back, you know the one?) Can be rolled up to from the shadows, and dispatched before he has time to react, or be alerted by the other bandits.
Dragon smithing, really? What for, to use up all those extra points? Because you can? Planning on making Dragonscale Armor, or where you sticking with the Nightengale set? Besides, you're a Nightblade, with Sneak, and Illusion, plus a bow. If you play it well, you should never be targeted, much less have to cap out your armor. (The Nightingale set will reach the 80% cap without a crafting loop.) I'd skip Smithing all together, a Nightblade gets all the bonuses to 1 shot anything from Sneak multipliers, and uses stealth for defense. The only real use for Armor is an Enchantment carrier. With Shrouded Handwraps, Assassin's Blade, Armsman(5), Silent Roll, and Critical charge, that's 24,000% base damage. If that's not enough, Smithing isn't going to save you.
Illusion can be pared down to Novice-Expert, Animage, Kindred Mage, QC, and MotM. I'm sure you also Want Dual Casting, and all the buffs up the middle, but that means filling in ALL 18 skills to 100 just so you have enough points to go around. What are you going to Frenzy a Steam Centurion for? Not telling you how to play here, but how you could do it, if you were actually leveling through experience.
Here:
Skyrim Perk Calculator - Plan the perks for your Skyrim character before spending them! This is an efficient build you can make with experience from actual Assassinations WITH THE EXACT SAME CAPABILITIES plus the Silent Roll/Critical Charge combo. You're welcome.
Or, you can go on and cheat your way out of hours of fun gameplay jumping right to the end, and use the Perks I freed up for you to add Enchantment so you can make your own Daedric Dagger of Leeching with Absorb Stamina, and Magicka to power Invisibility, and your charging Backstab.
