Is this a good bandit build?

Sounds great and I actually liked how you tied in the mastery build within savage blow, I maxed my savage blow first but mastery stabilizes damage that's being delt.

Sounds okay but,

 This may sound better

Level 30 - Mastery (1)
Level 31 - 3 Savage Blow (3)
Level 32 - 3 Savage Blow (6)
Level 33 - 3 Savage Blow (9)
Level 34 - 3 Savage Blow (12)
Level 35 - 3 Savage Blow (15)
Level 36 - 3 Savage Blow (18)
Level 37 - 3 Mastery (4)
Level 38 - 1 Mastery (5), 2 Booster
Level 39 - 3 Savage Blow (21)
Level 40 - 3 Savage Blow (24)
Level 41 - 3 Savage Blow (27)
Level 42 - 3 Savage Blow (30)
Level 43 - 3 Mastery (8)
Level 44 - 3 Mastery (11)
Level 45 - 3 Mastery (14)
Level 46 - 3 Mastery (17)
Level 47 - 3 Mastery (20)
Level 48 - 3 Haste (3)
Level 49 - 3 Haste (6)
Level 50 - 3 Haste (9)
Level 51 - 3 Haste (12)
Level 52 - 3 Haste (15)
Level 53 - 3 Haste (18)
Level 54 - 2 Haste (20), 1 Booster (3)
Level 55 - 3 Booster (6)
Level 56 - 3 Booster (9)
Level 57 - 3 Booster (12)
Level 58 - 3 Booster (15)
Level 59 - 3 Booster (18)
Level 60 - 3 Booster (20), 1 Dark sight (11)
Level 61 - 3 Dark sight (14)
Level 62 - 3 Dark sight (17)
Level 63 - 3 Dark sight (20)
Level 64 -
Level 65 -
Level 66 -
Level 67 -
Level 68 -
Level 69 -
Level 70 -
21 skill points remainder

I left the rest up to you because In my own opinion i think the rest of the skills are pointless, so what i've did is tackled out the important skills for you and left the rest on your own decision.