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starting campaign at 11th level, expected to end in high teens, maybe 20-21.
I've always wanted to try a crit-fishing build, so here is my attempt at it. I know this is pretty bad, so what can i do to make it better?

basic goal is: twin strike avenger with expanded crit range during paragon
  
a few notes to keep in mind for suggestions;
1) use LFR creation rules.
2) my goal is starting play with 19-20 crit range, but I would consider using Jagged enchant if there's a PP with expanded range at 16 that fits better.
3) prefer to be as item independant as possible.
4) priority to crit fishing, but I've chosen a strong secondary on DPR (as fits within above points).

what I have so far-

EDIT: changed a bit around based on feedback

====== Created Using Wizards of the Coast D&D Character Builder ======
Ishmael, level 11 Half-Elf, Avenger, Draeven Marauder
Build: Pursuing Avenger
Avenger's Censure Option: Censure of Pursuit
Half-Elf Power Selection Option: Dilettante
Chessenta (Chessenta Benefit)
Theme: Sohei  

FINAL ABILITY SCORES
STR 20, CON 13, DEX 14, INT 11, WIS 20, CHA 9  

STARTING ABILITY SCORES
STR 17, CON 10, DEX 13, INT 10, WIS 15, CHA 8    

AC: 25 
Fort: 23
Ref: 20
Will: 23
HP: 87
Surges: 8
Surge Value: 21  

TRAINED SKILLS
Acrobatics +12, Athletics +15, Endurance +11, Perception +17, Religion +10  

UNTRAINED SKILLS
Arcana +5, Bluff +4, Diplomacy +6, Dungeoneering +10, Heal +10, History +5, Insight +14, Intimidate +4, Nature +10, Stealth +7, Streetwise +4, Thievery +7  

POWERS
Basic Attack: Melee Basic Attack
Basic Attack: Ranged Basic Attack
Sohei Attack: Sohei Flurry
Avenger Feature: Abjure Undead
Avenger Feature: Divine Guidance
Avenger Feature: Oath of Enmity
Ranger Attack 1: Twin Strike
Avenger Attack 1: Overwhelming Strike
Avenger Attack 1: Radiant Vengeance
Avenger Attack 1: Angelic Alacrity
Avenger Attack 1: Aspect of Might
Avenger Utility 2: Holy Blessing
Avenger Attack 3: Fury's Advance
Avenger Attack 3: Relentless Stride
Avenger Attack 5: Living Death Strike 
Avenger Utility 6: Aspect of Agility
Avenger Attack 9: Blade of Repulsion
Endurance Utility 10: Enter the Crucible
Draeven Marauder Attack 11: Impaling Strike  

FEATS
Level 1: Spear Expertise 
Level 2: Weapon Focus (Spear)
Level 4: Unarmored Agility
Level 6: Two-Weapon Fighting
Level 8: Battle Awareness
Level 11: Versatile Master
Level 11: Two-Weapon Opening  

ITEMS
Prime Shot Spear +3 x1 
Magic Short Spear +3 x1  
Iron Armbands of Power (heroic tier) x1 
Amulet of Protection +2 x1
Magic Cloth Armor (Basic Clothing) +2 x1
Magic Holy Symbol +1 x1
Adventurer's Kit
1025 GP 
====== End ======

That's a retrain.

(Erachima seemed to cover it.  As a crit fisher you have two goals:

1. Chuck as many d20s as possible to get more crits
2. Do something important with those crits

Extra attacks on crits meet both goals)

prepping for play, updated a bit, incorporated most suggestions. two very big questions remain for me:

1) Theme! Sohei for a second minor action attack, or Ironwrought for an extra reroll?
extra minor only usable on my turn, better for nova round, and it can proc TWO. however, the extra reroll is easier to use.

2) am I actually accomplishing anything that a ranger|fighter/MC avenger doesn't? 
Disciple of Divine Secrets, Divine Channeler+Oath of Urgency, Acolyte Power+Holy Blessing; 6 rounds of rerolls? or is there a better way that uses less than 4 feats?

Ironwrought would also help you defensively. You will likely be bloodied very often with that AC.