The real reason to roll a Polearm Warden is that Warden's Fury is "melee weapon" meaning an enemy cannot shift away and attack, you still get to enforce your mark. They can shift away and charge, but with proper positioning that isn't an issue that often (not recommended for LFR, your group needs to cooperate much more then with say, a Fighter).
Here is my build from 1-11. Currently level 28 in my home campaign. If your DM allows you to take Mark of Warding, Dragonmark, take that at level 1 or 2. If you find your DM provokes zero OAs, drop Sudden Roots and take something else you like better. I went with Eternal Defender as my ED, giving me default Reach 3. I kept Warden's Lunge as an At-Will even though with the errata I can charge adjacent, because I do not have to charge adjacent. I can charge and mark from a distance and end next to a clump of enemies, or just stay out of an aura while keeping something marked, etc., If you go this route, Battle Awareness is easily the best MC feat.
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level 11
Goliath, Warden, Stoneblessed
Build: Earth Warden
Guardian Might: Earthstrength
Versatile Expertise: Versatile Expertise (Axe)
Versatile Expertise: Versatile Expertise (Polearm)
Background: Early Life - Isolated (+2 to Perception)
FINAL ABILITY SCORES
Str 21, Con 21, Dex 13, Int 9, Wis 13, Cha 11.
STARTING ABILITY SCORES
Str 16, Con 16, Dex 12, Int 8, Wis 12, Cha 10.
AC: 26 Fort: 23 Reflex: 19 Will: 20
HP: 108 Surges: 14 Surge Value: 27
TRAINED SKILLS
Nature +13, Endurance +14, Perception +13, Athletics +16, Heal +11
UNTRAINED SKILLS
Acrobatics +5, Arcana +4, Bluff +5, Diplomacy +5, Dungeoneering +6, History +4, Insight +6, Intimidate +5, Religion +4, Stealth +5, Streetwise +5, Thievery +5
FEATS
Level 1: Sudden Roots
Level 2: Guard of Stone
Level 4: Goliath Greatweapon Prowess
Level 6: Versatile Expertise
Level 8: Hafted Defense
Level 10: Toughness (retrained to Unyielding Stone at Level 11)
Level 11: Battle Awareness
POWERS
Warden at-will 1: Warden's Lunge
Warden at-will 1: Weight of Earth
Warden encounter 1: Roots of Stone
Warden daily 1: Form of Winter's Herald
Warden utility 2: Inspiring Fortitude
Warden encounter 3: Earthgrasp Strike
Warden daily 5: Form of Mountain's Thunder
Warden utility 6: Bear's Endurance
Warden encounter 7: Mountain's Stature
Warden daily 9: Form of the Oak Sentinel
Warden utility 10: Spiritual Rejuvenation
ITEMS
Maw of the Guardian Halberd +2, Iron Armbands of Power (heroic tier), Battle Harness Hide Armor +2, Cloak of the Walking Wounded +2
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