Going off of what this guy said:
Here are my experiences with assassin (I've spent a lot of time on him, full colo and all that)
1) It's a waste of points going to hiding exceed -- hiding doesn't help your own damage output and the utility you get from it isn't worth it. The most utility you get out of it is farming dungeons where you need to just sneak to bosses in the fastest manner possible. 2/3 hiding will make you faster than a non-hidden walking character, and you can go 3/3 if farming is your thing, but hiding exceed shouldn't be touched, you're taking too many valuable points from damage skills.
2) If you need to shave points from somewhere, this is the least damage-hindering place to remove them from. A 5 combo-point level 1 DB is still 52% damage compared to a max of 60%. Assassin has another combo ender in shadow explosion which means DB is going to see less usage as your vigor levels rise. Rogues often choose to max it because it's their only combo ender and they have the rather amazing combo mastery to really abuse it.
3) There's no point for DI on assassin. Shadow Assault is a ranged knockdown teleport which deals the same damage as level 5 DI at base, and it can be used when not hidden either.
4) Yes, shadow claw is a significant self-buff. The most geared assassin I've seen has reached 61% crit (this is with shadow claw on) and I highly doubt an assassin can hit 70% crit rate without it. If gear/P2W material really does become that powerful, I guess you can skill reset but that's a long, long way off. Also, don't put more than 1 point in shadow assault unless you are going for a full-out PvP build, it's not a DPS skill, it's there for utility.
5) I don't know. Shadow Armor is one of the saving graces of assassin and one of the few things we have over Rogue. Our mobility and shadow armor let us handle AoEs much better than almost any other class. It's amazing for both PvE and PvP, and you WILL want it maxxed for raiding. It saves your butt through things you wouldn't have thought possible.
And ignoring what he said about not putting points into Hiding or Hiding Exceed since the main reason I'm making a sin really is to farm bosses anyways, what do you guys with experience think is right/wrong with this build:
http://www.ro2base.c...1.1.1/0.0.0.0.0
Personally I'm not seeing any problems with it if I'm interpreting the skills right, seems like I should be getting the DPS needed without sacrificing fast dungeon running, but generally interpreting skills without any experience is a no-no.